That's a huge milestone in fetal development.

这是发育中的重要里程碑。

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

我们出生之前，人类发育出三种不同的类型。

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

一是保持发育的湿润环境，但它同样扮演了减震器的功能。

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，可以提供有关怀孕期间发育情况的信息。

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发育的第 14 天。”

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

今天，我们知道人类的尾巴会随着的发育而被溶解。

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

发育过程由三个层组成，分别是：外层、中层与内层。

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精后14天的发育。

They are also important in the development of embryos.

它们发育中也很重要。

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的神经元发育时未能从鼻区域迁移至下丘脑。

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，触发第二个开始发育。

Researchers say the embryo models cannot grow into babies.

研究人员表示，模型不能发育成婴儿。

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

这对于发育早期的研究尤为重要。

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。

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

这些受精后8天半的时间里和自然受精的老鼠的发育情况一致。

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

过去曾培育出模仿发育早期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，其畸形发育数量让我惊骇不已。

Now during development, the fetus doesn't use the lungs yet, and relies on oxygenated blood from the placenta that comes into the right atrium.

发育期，儿的肺还没有使用，其主要依赖于来自盘进入到右心房的氧合血。