Enteroderm
消化道内胚层
🗣️ 情景例句
Is this OK?
这样可以吗？
He who would search for pearls must dive below(or deep).
欲寻珍珠，须潜水下。
So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.
从测定海深到测定鱼群，这一进展比较容易。