For example, the language part of the brain develops when a person is very young.

，人们小时候，大脑的语言部分就会开始发育。

That's when neurodevelopment begins, when the brain starts developing.

这时神经发育开始，大脑开始发育。

Then groups of heavy, eight-to- twelve-centimeter-long fruits that look like mangoes start to develop.

然后，一簇簇看起来像芒果的水果开始发育，它们很重、有812厘米长。

The disruption in hormones prevents puberty from beginning or successfully completing.

激素的中断阻止了青春期发育开始或完成。

After nine months, the first baby leaves the pouch, triggering the second embryo to start developing.

九个月后，第一个幼崽离开育儿袋，发第二个胚胎开始发育。

And once this second baby leaves the pouch, the third embryo starts to develop, and the cycle continues.

第二个幼崽一离开育儿袋，第三个胚胎就开始发育，就这样一循环下去。

There, the early spring weather can be too warm and the grapes begin to develop before they should.

那里，早春的天气可能太温暖，葡萄提前开始发育。

Around 7 weeks the male sex organs start to develop because of a gene on 'Y' chromosome called 'SRY'.

大约7周左右，男性性器官开始发育，这是由于“Y”染色体上有一种叫做“SRY”的基因。

The caterpillar doesn't really start forming or developing until that egg is laid, and then the clock really starts ticking.

毛毛虫卵才真正开始形成或发育，然后时间开始推移。

Later in pregnancy, probably around 28 weeks, the fetal auditory system really starts forming so they can start to hear.

怀孕后期，大约 28 周左右，胎儿的听觉系统开始真正发育，因此他们可以开始听声音。

Then, after two days, a little chick will begin to form inside the egg, just on the top of the yolk.

经过两天之后, 一只小鸡就会鸡蛋之中展露雏形, 从蛋黄顶部开始发育。

The sperm and the egg, basically they come together, and then they start developing.

精子和卵子基本上结合一起，然后开始发育。

The whole thing increases in size, and bundles of cells start developing into support structures.

整个体积变大，细胞束开始发育成支撑结构。

At that time, I really started developing really under eye bags.

那时，我真的开始眼袋下发育。

Girls develop breasts and their  bodies become able to have babies.

女孩的乳房开始发育，她们的身体开始具备生育能力。

And listen, I started off in neural development.

听着, 我开始神经发育。

The womb represents the very first place in which life takes form.

【form】子宫就是生命开始发育的地方。

Around 24 weeks in, the lung structures that swap out oxygen and carbon dioxide, called alveoli, start developing.

大约 24 周后，交换氧气和二氧化碳的肺部结构（称为肺泡）开始发育。

Upon successful fertilization, the zygote immediately begins developing into an embryo, and takes about three days to reach the uterus.

受精成功后，受精卵立即开始发育成胚胎，大约需要三天才能达子宫。

Second, the eggs produced, by the female need to begin to develop on their own, forming an early stage embryo.

其次， 雌性生的卵子需要开始自行发育，形成早期胚胎。