The primitie mouth, or stomodeum, is a slight depression on the surface of the ectoderm.
原口（或口凹）是外胚层表面一个轻微凹。
Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.
外胚层表面呈双边卵圆形增厚形成鼻板，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.
在胎儿发育早期，受精卵外层，即外胚层，开始形成脊状突起，最后形成神经管。
The jellyfish body is mainly composed of mesoglea, a jelly-like fluid sandwich between the outer ectoderm and the inner digestive cavity the endoderm.
水要由中间胶质组成，中间胶质是一种果冻状液，夹在外外膜和内消化腔内膜之间。
The layer of cells, the endoderm, is thin, like the ectoderm, allowing nutrients to be directly absorbed into the surrounding cells.
细胞内胚层很薄，像外胚层一样，可以让营养物质直接被周围细胞吸收。
The jellyfish absorbs oxygen through its ectoderm and can store it in the mesoglea.
水通过外胚层吸收氧气，并将其储存在中胶层中。
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划词翻译
详细解释
口（或口凹）是外胚层表面
。
展成为额鼻隆起
要由中间胶质组成，中间胶质是一种果冻状
