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Dimethyl phenylethyl carbinyl acetate (DPCA ) was synthesized by using a new catalyst. This technology decreases the pollution and can also be used in synthesis of other carbinyl acetates perfume.

一种新型催化剂合成酸二甲苯酯(DPCA),并简化了合成工艺,减少了生产过程中产生的三废,因而投入生产已具备了件。这种新型催化剂可于其它酯类香料的合成。

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By using Taylor's formula, the article deduces the sufficient condition of the existent extreme value and the necessary condition of the inexistent extreme value of trinary function.

通过利泰勒公式推导出判断三元函数极值存在的充分件和极值不存在的件。

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Thus, the boron-bearing rock system and the magnesian rocks are the foundation of the borate deposits, whereas regional metamorphism and migmatitization and tectonism are the necessary conditions.

含硼岩系、镁质容矿岩石是硼矿形成的物质础,区域变质及混合岩化作、构造活动是硼矿形成的件。

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The metallogenic material was from deep alkalic basaltic magma, and the pulsatory invasion was the necessary metallogenic condition of the ore deposit.

成矿物质源于碱性玄武岩浆,性次火山岩浆多次脉动式入侵是矿床形成的件。

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It provides a significant condition for data management of digital human body, multi-data introject and imitation and virtual technique.

为数字人体的数据管理、多种数据融合与仿真虚拟技术提供了件。

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自我提书单

Power is required for the accumulation of money and then the retention of that money.

权力是积累金钱和保存金钱的要条件。

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科普小杂文

To create clouds, and to have rain, the air has to be cooled.

要想产生云彩,进而下雨,空气遇冷是要条件。

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哈佛大学公开课《公正该如何做是好》

Well all right, so what would you conclude for that though for the larger issue here, would you conclude that, therefore consent is a necessary condition of their being an obligation?

好吧,那你的结论是什么广泛来说,你是否会得出结论,同意是义务存在的要条件?

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VOA Daily Standard 2019年4月合集

And that change will only occur if four key elements are met, notes the WHO.

这种改变发生的要条件是以下4个因素满足,这是WHO的观点。

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Scishow 精选系列

Oxidizers are compounds that steal electrons from other chemicals in a reaction and they are what make combustion possible.

氧化剂是一种化合,它在氧化反应中会从别的化学质中偷取电子,它们也是燃烧的要条件。

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科拉诺斯动画科普

Pressure control is another necessity inside any ocean habitat.

可控的压力是建造海洋栖息地的另一个要条件。

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当月 CNN 10 学生英语 2021年2月合集

Now Olympic officials have said that vaccinations will not be a prerequisite for athletes hoping to compete in these games but there will be rules that they have to follow.

现在,奥林匹克官员表示,将不会把接种疫苗作为参加本届奥运会的运动员的要条件,但他们须遵守相关规定。

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正音:美语发音基础教程

One of the essential requirements of good news writing is accuracy.

优秀新闻报道的要条件之一是准确。

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老子的人生智慧

So, what if 'doing' isn't always necessary to get things done?

那么,如果“做”并不总是完的要条件呢?

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雅思听力最新机试真题

Therefore, what is essential for an academic success will be shared in this workshop.

因此,本次研讨会将分享学术功的要条件。

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咱们裸熊

Well, we gotta get ready for hibernation somehow! Eating a lot is definitely a requirement!

我们得为冬眠做好准呀!大吃特吃可是要条件!

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VOA慢速英语_教育

The SAT is a test many American colleges require as part of the admissions process.

SAT这项考试是美国许多大学录取过程中的一项要条件。

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生活中的科学

It's absolutely necessary for your brain and body to recharge.

是大脑和身体充电的绝对要条件。

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独处的意义

Friends can be a blessing, but they're not essential to survive anymore.

朋友可能是一种福报,但它们不再是生存的要条件。

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慢节奏里的浪漫

Do as much work on the inside as is needed for you to bloom.

在内心做尽可能多的工作,因为这是你绽放的要条件。

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VOA Daily Standard 2017年12月合集

Acknowledging this as a fact is a necessary condition for achieving peace.

承认这一点为实是实现和平的要条件。

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心理学小课堂

It's considered essential to succeed, but in truth is an unending series of life lessons.

它被认为是功的要条件,但实上,它是一系列永无止境的人生课程。

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学习高效指南

Pain is necessary for us to fix our problems.

痛苦是我们解决问题的要条件。

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人类:我们所有人的故

Have fewer traces of copper than those of Europe, Essential for the formula to work.

与欧洲出产的银矿石相比 含铜量更少,而铜正是这种化学反应生效的要条件。

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休伯曼实验室(视频版)

Do you think those hardships were necessary to flip the switch?

你认为那些艰难的经历是按下开关的要条件吗?

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interfertile, interfertility, inter-fertility, inter-fibre-bond, interfibrillar, interfibrous, interfile, inter-filler, interfinger, interfingering,

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