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Fluoroaniline is synthesized in two steps from p-nitrochlorobenzene and active potassium fluoride.

以对氯硝基苯和活性氟化钾等为原料,经二步法对氟苯胺。

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PFOA and other related long-chain fluorochemicals stick to blood proteins and masquerade as digestive acids.

PFOA和其他相关的长链含氟化附著在血液里的蛋白质,假装消化酸分子。

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It has converted yellowcake into uranium hexafluoride gas.

它已经把“黄饼”转化为六氟化铀气体。

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It reacts violently with oxygen difluoride and barium peroxide.

一氧化碳同氟化氧、氧化钡发生剧烈反应。

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The experiments suggest that the superfluorescence of fluoride glass fibr is a kind of low coherence and high performances light source with bright application prospect.

实验表明利用氟化物玻璃光纤有望获得性能优异的有应用前景的低相干度集化光源。

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Pyridine can react with halogens,nitronium fluoroborate, sulfur trioxide, boranes and chromium trioxide to form some useful organic reagents which are introduced briefly in the paper.

吡啶可以和素、硝基四氟化硼盐、三氧化硫、硼烷及三氧化铬反应,形一些有用的有机试剂。

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Tussore oil was extracted by chemical .The fatty acid (FA) in tussore oil was saponificated and modified to methyl esters by different means .

研究脂肪油的衍生化、三氟化硼、硫酸3种不同方法对脂肪油的皂化、甲酯化效果,并用GC/MS法对柞蚕中脂肪酸的分进行鉴定和分析。

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The carbon-fluorine single bond is among the strongest known and results in PFA being virtually chemically insert and nonwettable by fluids such as water.

氟化碳单键间的结力很强使得PFA(可溶性聚四氟乙烯)塑料不体如水所介入和湿润。

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In the atomic energy field and nuclear weapons production,it act as the raw material of uranic fluoride ,fuels and additives of rockets.

在原子能工业和核武器生产中,氟化氢是制造六氟铀的原料,也是生产火箭燃料和添加剂的原料。

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Sevoflurane is synthesized from aceton by vapor phase catalytic fluorination, vapor phase catalytic hydrogenation,chloridization and fluoromethylation, which gives a new synthetic method.

以丙酮为原料,经氯化、气相氟化、气相氢化及氟甲基化等一系列改进的方法七氟醚,提供一条新的路线。

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The key technology and technics,which use Simons electrolyze trough with a falcial anode to synthesize lithium fluoroalkylphosphates,are discussed in this paper.

本文探讨采用以镍板为阳极的西蒙斯电解槽电解氟化制备氟烷基膦酸锂的有关工艺和关键技术。

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T calculated from the characteristic temperatures shows that the thermal stability of fluorophosphate glass is better than fluoride glass.

数据显示氟磷酸盐玻璃的热稳定性比氟化物好。

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The effects of polyisobutene, LaF3, MCA, dialkyldithioaminoformaite on properties of lithium-calcium base grease have been discussed in this paper.

考察聚异丁烯、氟化镧、三聚氰胺氰尿酸复物(MCA)、硫代氨基甲酸盐对锂-钙基脂性能的影响。

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Ammonium bifluoride is an inorganic fluoride salt, whose consumption and output exceed tmi thousand of tons in China.

氟化氢铵是一种产量和用量都较大的无机氟盐,国内年产量在数万吨以上。

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Benzaldehyde and acetone used as materials,the benzylidene acetone is synthesized in the presence of potassium fluoride on alumina.

以苯甲醛和丙酮为原料,氟化钾氧化铝作催化剂苄叉丙酮。

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TheyThe use a fluorid of fluoride to protect teeth is common in many parts of the world.

氟化物保护牙齿世界上很多国家所使用。

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Reaction of ferrocenylphenylcarbinol with ethereal solution of boron trifluoride in dichloride methane formed the relevant ferrocenylphenylmethyl carbocation.

二茂铁基苯基甲醇与三氟化硼-乙醚溶液在二氯甲烷中作用,形二茂铁苯基甲基碳正离子。

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Crystalline polypyrene microsheets were electrosynthesized in the medium of boron trifluoride diethyl etherate for the first time.

在三氟化硼乙醚介质,电聚芘首次制备出结晶型的聚芘微米片。

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CNN 10 学生英语 2019年4月合集

In extreme cases this can cause pits in the teeth and some studies outside the U. S. have suggested that pregnant women with higher amount of fluoride in their bodies can have children with lower IQ scores.

在极端情况下,这会导致牙齿凹陷,美以外的一些研究表明,体内氟化物含量较高的孕妇可能会生出智商较低的孩子。

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6 Minute English 六分钟英语

You shouldn't believe everything you hear, Rob. Fluoride protects our teeth against decay.

你不应该听到什么都相信,罗伯。氟化物能够保护我们的牙齿不被腐蚀。

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Scishow 精选系列

Fluorinating agents rip other molecules apart to replace their hydrogen atoms with fluorine.

氟化剂会打破分子结构,然后用氟取代原来的氢原子。

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和Ariannita学美式英语(双语精选)

So there are some restrictions for fluoride.

氟化处理有一些限制。

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Crash Course 世界神话学篇

A reservoir with more dreams...and less fluoride.

一个拥有更梦想......更少氟化物的水库。

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加拿大剧拯救希望第一季

I need a flexible bronchoscope and an O.P.A.

给我拿可曲式气管镜还有氟化

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地理科普(视频版)

Having up to 35,000 teeth in a lifetime and being replaced sometimes in as little as 24 hours, shark teeth are also coated in fluoride, making them cavity and age-resistant.

鲨鱼一生中有达 35000 颗牙齿,有时在 24 小时内就会被,鲨鱼的牙齿也被氟化物覆盖,使它们具有蛀牙和抗衰老的能力。

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VOA Daily Standard 2025年2月合集

Kennedy says he wants to work to end chronic disease, break any ties between employees at the U.S. drug regulator and industry and advise U.S. water systems to remove fluoride. That was Reuters correspondent Jillian Kitchener.

肯尼迪表示,他希望努力消除慢性病,切断美药品监管机构员工与行业之间的任何联系,并建议美供水系统去除氟化物。路透社记者吉莉安·基钦纳 报道。

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Vox 观点

The rate of tooth decay in children's baby teeth was already on the rise that after they took the fluoride out of the water, that rate spiked.

儿童乳牙的蛀牙率本已在上升,而在停止添加氟化物后,这一比率急剧上升。

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日常生活医学科普

If action is taken at this point, by supplying enough minerals and Fluoride, the enamel can still repair itself and the decay can be stopped or even reversed.

如果在这时候采取行动,通过提供足够的矿物质和氟化物,牙釉质仍然可以自我修复,龋齿可以停止甚至逆转。

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《卫报》(文章版)

The bones of residents of the area around the lake weaken uncommonly fast, and Onywere was investigating whether this may be linked to high fluoride levels in the water.

该湖周围地区居民的骨骼异常快速变弱,奥尼韦尔正在调查这是否可能与水中的高氟化物水平有关。

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Asap SCIENCE 精选

Fluoride is very safe in small doses and can help fight cavities but ingesting around 24 tubes with 170 milliliters or 6 ounces each could be fatal.

小剂量的氟化物是非常安全的,可以帮助治疗蛀牙,但是摄入大约24支170毫升或6盎司的氟化物可能是致命的。

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Osmosis-消化

In addition, brushing and flossing are useful because they physically remove dental plaque and deliver fluoride to the teeth to help with remineralization.

此外,刷牙和使用牙线很有用,因为它们可以通过物理方法去除牙菌斑,在牙齿表面涂氟化物可以帮助牙齿再矿化。

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科学60秒-科学美人 2022年6月合集

To compound the problem, the liquids used for all this comfort — first chlorofluorocarbons and now hydrofluorocarbons — are super-strength greenhouse gases.

人们为了这份舒适而使用的液体冷却剂——先是氯氟化碳现在是氢氟化碳——都是超强度的温室气体,而这让问题变得更糟。

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CRI在线 2023年7月合集

A U. S. military base in Japan has acknowledged three incidents of chemical leakage containing organic fluorine compounds that raise health concerns.

驻日美军军事基地承认三起含有有机氟化合物的化学物质泄漏事件,这些事件引起了健康问题。

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科学60秒 听力 2015年3月合集

And that's where the fluoride hangs out, helping to stave off an acid attack of the enamel—in other words, a cavity.

氟化物就在这里聚集,帮忙延缓阻挡牙釉质的酸蚀—句话说抑制蛀牙。

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科学60秒 听力 2013年5月合集

They found that three different strains of cavity-causing bugs cling less tightly to enamel that's been rinsed with fluoride.

他们发现引起蛀牙的三种不同的菌株很少粘附于有氟化物加固的牙釉质表面。

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科学60秒 听力 2014年8月合集

NASA's James Webb Space Telescope, due to launch in 2018, should be powerful enough to detect chlorofluorocarbons, CFCs.

将于2018年发射的美宇航局的詹姆斯韦伯太空望远镜应该强大到足以检测氯氟化碳, 氯氟烃。

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时差N小时

Dentists can help by giving you a fluoride treatment, but you have to brush and floss regularly.

医生还可以为你做氟化物治疗(在蛀牙部位涂上高浓度的氟化物,令初期蛀坏的部分还原),但是,你必须定期洗牙,还要经常使用牙线清洁牙齿。

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CNN 10 学生英语 2019年4月合集

The U. S. Food and Drug Administration is considering a lower limit on the amount of fluoride that's allowed in bottled water.

食品和药物管理局正在考虑降低瓶装水中氟化物的允许含量。

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