And the waterproof membranes and the amniotic fluid inside the egg created a self-contained pond so the embryo stayed hydrated.
卵子内的防水膜和羊水形成了一个独立的池塘，使胚胎保持水分。
Waterproof membrane
原声例句
PBS地球-动物趣闻
英语百科
Waterproofing
Waterproofing is the process of making an object or structure waterproof or water-resistant, so that it remains relatively unaffected by water or resisting the ingress of water under specified conditions. Such items may be used in wet environments or under water to specified depths.
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