The jellyfish absorbs oxygen through its ectoderm and can store it in the mesoglea.

水母通过外胚层吸收氧气，并将其储存在中胶层中。

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

胚胎发育过程由三个胚层组成，分别是：外胚层、中胚层与内胚层。

The other type are immature teratomas, and they develop specifically from neuroectoderm cells - which come from the ectoderm layer.

二种是未成熟畸胎瘤，专门由神经外胚层细胞发育而来，来自外胚层。

The layer of cells, the endoderm, is thin, like the ectoderm, allowing nutrients to be directly absorbed into the surrounding cells.

细胞的内胚层很薄，像外胚层一样，可以让质直接被周围的细胞吸收。

The jellyfish body is mainly composed of mesoglea, a jelly-like fluid sandwich between the outer ectoderm and the inner digestive cavity the endoderm.

水母的身体主要由中间胶质组成，中间胶质是一种果冻状的液体，夹在外外膜和内消化腔内膜之间。

The jellyfish's outer layer of cells, called the ECTODERM, is so thin that oxygen dissolved in the water can simply diffuse right through it.

水母的外胚层细胞非常薄，溶解在水中的氧气可以直接穿过它。

Very early on in fetal development, the ectoderm which is the outer layer of the fertilized egg starts to develop a bit of a ridge that eventually becomes the neural tube.

在胎儿发育的早期，受精卵的外层，即外胚层，开始形成脊状突起，最后形成神经管。