Germ layer theory
[医] 胚层学说
🧩 词语组成解析
layer
['leiə]
n. 层，层次;膜;[植]压条;放置者，计划者;
vt. 把…分层堆放;借助压条法;生根繁殖;将（头发）剪成不同层次;
vi. 形成或分成层次;[植]通过压条法而生根;
🗣️ 情景例句
Sit down, sit down. Have some coffee.
请坐， 请坐。喝点咖啡。
How often do you go swimming?
你多久去游一次泳？
Then, when it's open, we fight about who plays with it first.
然后，当礼物打开后，我们又争着谁先来玩。