Polycycline
(=tetracycline)四环素
🔁 扩展释义
【化】 四环素
🗣️ 情景例句
Aren't you exhausted?
你不会精疲力尽吗？
The world is a ladder for some to go up and others to go down.
世界好似一把梯，有人上去有人下。
A child ran into the street and knocked her off her bicycle.
一个孩子冲上马路，把她从车上撞了下来。