The primitie mouth, or stomodeum, is a slight depression on the surface of the ectoderm.
原始口（或口凹）是外胚层表轻微凹。
Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.
外胚层表边卵圆形增厚形成鼻板，然后发展成为额鼻隆起下半部分。
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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，开始形脊状突起，最后形管。
The jellyfish body is mainly composed of mesoglea, a jelly-like fluid sandwich between the outer ectoderm and the inner digestive cavity the endoderm.
水母的体主要由胶质组，胶质是一种果冻状的液体，夹在外外膜和内消化腔内膜之。
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，可以让营养物质直接被周围的细胞吸收。
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，并将其储存在胶层。
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划词翻译
详细解释
口（或口凹）是外胚层表
轻微
。
边卵圆形增厚形成鼻板，然后发展成为额鼻隆起
脊状突起，最后形
管。
体主要由
胶质组
