Ectoblast
n. 外胚层\\n[医] 外胚层, 外膜
🗣️ 情景例句
How long will this letter take to get there?
这封信需要多长时间到那儿？
Many a little (or pickle) makes a mickle.
积少成多。
Boiling is always a good way of treating water.
烧开一直是水处理的一种好办法。