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

水母通过外层吸收氧气，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.

胎发育过程层组成，分别是：外层、中层与内层。

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，专门外层细胞发育而来，来自外层。

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

细胞的内层很薄，像外层一样，可以让营养物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。

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，即外层，开始形成脊状突起，最后形成管。