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

今天，我们知道人类胚胎的尾巴会随着胚胎的发育而被溶解。

Editing human embryos used for reproduction is still banned.

然而，以繁育目的编辑人类胚胎的行为仍被禁止。

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

在我们出生之前，人类胚胎发育出三种不同的类型肾脏。

And of course, then the closer you get to a human embryo.

当然，越接近人类胚胎。

For example, most countries ban the editing or modification of genes in human embryos.

例如，大多数国家禁止编辑或修改人类胚胎中的基因。

Several international research teams have been working separately on studies involving human embryo models.

一些国际研究团队一直在分别开展涉及人类胚胎模型的研究。

For the first time, scientists in China use CRISPER to edit the genomes of human embryos.

中国科学家首次使用CRISPER编辑了人类胚胎的基因组。

Scientists said the success could be used in creating human embryos for research in the future.

科学家表示，这一成功可以用于未来培育人类胚胎的研究。

The Israeli researchers say their embryo model looks similar to a real human embryo at day 14.

以色列研究人员表示，他们的胚胎模型在第 14 天看起来与真正的人类胚胎相似。

Yes, actually. UK scientists have been authorised by the government to genetically modify human embryos for research.

还真有。英国科学家已经获得政府批准对人类胚胎进行以研究为目的的基因修改。

But it is just a matter of time before someone, somewhere, edits human embryos that are grown into babies.

但是出现编辑过的人工胚胎成长为婴儿之事只是时间问题。

The writers of several studies described models that look similar to human embryos nine to 14 days after fertilization.

几项研究的作者描述了受精后9至14天看起来与人类胚胎相似的模型。

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胚胎发育的第 14 天。”

Human cells in the chimera's epiblast behaved more like those found in human embryos than those found in monkey embryos.

嵌合体外胚层中的人类细胞的行为更近似于人类胚胎细胞，而不像猴子胚胎细胞。

Editing human embryos used for reproduction is still banned, however.

然而，编辑用于繁殖的人类胚胎仍然被禁止。

Back then, you couldn't do it on human embryos.

彼得：当时，你无法在人类胚胎上做到这一点。

It's becoming ever clearer just how important a human embryo's first few weeks are.

人们越来越清楚人类胚胎最初几周的重要性。

That is the point in many pregnancies when problems happen and human embryos most often die.

这就是许多怀孕发生问题并且人类胚胎最常死亡的时刻。

To study later phases, scientists have made and analysed high-resolution, 3D atlases of human embryos and fetuses.

为了研究后期阶段，科学家制作并分析了人类胚胎和胎儿的高分辨率 3D 图集。

Scientists in Britain and the US say they've created synthetic human embryos using stem cells bypassing the need for sperm or eggs.

英国和美国的科学家宣布，已成功使用干细胞创造出全球首个人工合成的人类胚胎模型，而不需要精子或卵子。