Tetracyclines
(tetracycline 的第三人称 -s形式) n. 四环素\\n[化] 四环素
🗣️ 情景例句
Do you really think so?
你真的这么想吗？
I didn't know whether to send the letter airmail or not.
我不知道是否送航空邮件。
As long as all was still, the pen drew a straight line,
只要一切都是静止的，笔就会划出一条直线；