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
Does this car have good fuel economy?
这种车省油吗？
In this flat country people grow wheat and corn and raise cattle.
在这个平原国家人种小麦和玉米并且养牛。
The situation seemed hopeless and he knew his life was in danger.
这种情况看来是毫无希望了，他知道他有生命危险。