Dark clouds are often treated as precursor of a storm.

乌云通常被当作暴风雨的兆。

Explosive war materiel removal is a crucial precursor in stabilizing post-conflict areas.

爆炸性战争物资的清除是稳定战后地区的重要提。

The main precursor to plastic is a byproduct of petroleum refining called hydrocarbon gas liquids.

塑料的身是石油提炼的副产品，被称为液化烃气。

War acts as a necessary precursor to peace.

战争是和平的必要提。

The more parents engaged in one-on-one baby talk, the more the baby babbled—which is a precursor to word production—and the more words they produced at age two.

父母用一对一的方式和婴儿交谈越多，后者咿呀学语就会更多—这些都是词语构建的体音节—并且这些孩子们在2岁左右就能说更多的单词。

We turn into chemicals that are essential precursors for products such as nylon, nylon yarn, also nylon resin that can be used to make products in the automotive and apparel industries.

我们将其转化为化学物质，这些化学物质是诸如尼龙等产品的基本体，尼龙纱，也是尼龙树脂，可用于制造汽车和服装行业的产品。

Theca cells make androstenedione, a sex hormone precursor, and granulosa cells use the enzyme aromatase to convert it into estradiol - a member of the estrogen family.

内膜细胞可以成雄烯二酮，是性激素的体；颗粒细胞的芳香酶使它变成雌二醇，是雌激素的一种。

Also, did you know that the Persian Royal Road was its precursor?

此外，你知道波斯御道是它的身吗？

Oh, and he also tried his hand at inventing a fairly primitive but innovative motion picture technique, new types of eyeglasses and a velocipede which is a precursor to the bicycle.

他还尝试发明了一种相当原始但富有创新精神的电影技术，新型眼镜和自行车的身——自行车自行车。

Specialized cells are differentiated from its precursor stem cells to maintain the body's internal environment.

特化细胞由其体干细胞分化而来，以维持机体的内部环境。

These are the main precursors to most of the plastic in the world.

这些是世界上大多数塑料的主要身。

Others have been reclassified as precursors of the modern annelids.

别的已经被重新归类于现代环节动物的先驱。

Now, T-cell development starts in the thymus from precursors that arise in the bone marrow.

现在来看T细胞，它们由从骨髓中产生的体T细胞在胸腺中发育而来。

Now, I would argue that lysozyme is the essential precursor to penicillin.

我认为溶菌酶是青霉素的基本身。

Even though the plays are wildly unrealistic, they're actually a precursor to realism.

这些戏剧尽管非常地不现实 但它们其实竟是现实主义的先驱。

The gathering is a precursor of the BRICS Leaders' Summit in South Africa in August.

这次会议是 8 份在南非举行的金砖国家领导人峰会的奏。

We applaud the UN Office on Drugs and Crime and the International Narcotics Control Board for taking steps to accelerate information sharing and analysis with regard to the many substances and precursor chemicals used to make synthetic opioids.

我们称赞联国毒品和犯罪办公室以及国际麻醉品管制局采取措施，以加速信息共享和分析，这些信息有关于制作成阿片类药物的物质和易制毒化学品。

This was the precursor to the hugely popular High Line that now occupies a disused elevated freight railway in Manhattan, which first opened in 2009 and Thomas Heatherwick's unrealised Garden Bridge in London, proposed in 2013.

这是曼哈顿广受欢迎的高线公园以及的托马斯·海瑟维克在 2013 提议但尚未实现的伦敦花园桥的身，高线公园于 2009 首次开放，原来是曼哈顿的一条废弃的高架货运铁路。

So the current working model is that a unique mix in my mom's womb caused the precursor genitals to transform one way, but the precursor brain to transform the other way.

因此，目的工作模式是，在我妈妈的子宫中，一种独特的混转化成先期的生殖器官，而先期的大脑则是采用另一种转化方式。

But there are other important lipids, like cholesterol, which is the precursor to things like testosterone and estrogen and, of course, phospholipids, which form the cell membrane in every single one of the three-dozen-or-so-trillion cells you have.

但是还有其他重要的脂质，比如胆固醇，它是睾酮和雌激素的体，当然还有磷脂，它们在你拥有的 36 个或大约万亿个细胞中的每一个细胞中形成细胞膜。