That's a huge milestone in fetal development.

这是胎发育中的重要里程碑。

Before we're born, human embryos develop three different types of kidneys.

在我们出生之前，人类胎发育出三种不同的类型肾脏。

But they are complete enough to provide information about what happens in the embryo during a pregnancy.

但它们已经足够完整，可以提供有关怀孕胎发育情况的信息。

One is to keep the embryo that's developing moist, but it also acts as a shock absorber.

一是保持胎发育的湿润环境，但它同样扮了减震器的功能。

During fetal development, the entire body derives from three layers, called germ layers, the ectoderm, mesoderm, and endoderm.

胎发育过程由三个层组成，分别是：外层、中层与内层。

But he added that " the farthest we could get is day 14 in human embryo development."

但他补充说，“我们最多只能做到人类胎发育的第 14 天。”

She said the model her group worked with appears similar to embryo development up to 14 days from fertilization.

她说，她的团队研究的模型看起来类似于受后14天的胎发育。

Today, we know human embryos have tails that dissolve as the embryo develops.

今天，我们知道人类胎的尾巴会随着胎的发育而被溶解。

Researchers say the embryo models cannot grow into babies.

研究人员表示，胎模型不能发育成婴儿。

They are also important in the development of embryos.

它们在胎发育中也很重要。

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，触发第二个胎开始发育。

This is especially important for research of the early period of embryonic development.

这对于胎发育早的研究尤为重要。

One is to shed light on the complicated process of embryological development, which might eventually lead to treatments for some congenital diseases.

一是阐明胎发育的复杂过程，这最终可能导向对某些先天性疾病的疗法。

These include Kallmann syndrome, where GnRH producing neurons fail to migrate from the nose region to the hypothalamus during fetal development.

这包括Kallmann综合征，即制造GnRH的神经元在胎发育时未能从鼻区域迁移至下丘脑。

Those embryos followed the development of natural mouse embryos up to eight and a half days after fertilization.

这些胎在受后8天半的时里和自然受的老鼠胎的发育情况一致。

Blastoids and gastruloids mimicking earlier stages of embryonic development have been grown in the past.

过去曾培育出模仿胎发育早阶段的类细胞和类原肠。

And then you can see the brain developing in the embryo.

然后你可以看到大脑在胎中发育。

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，第三个胎就开始发育，就这样一直循环下去。

I was horrified by how many deformed embryos developed in animals that had eaten cesium-contaminated food.

食用铯污染食物的动物胎，其畸形发育数量让我惊骇不已。

We can see the development of the chick inside the egg of the embryo.

我们可以看到蛋内胎的小鸡发育情况。