Diazetine
二氮杂环丁烯
🗣️ 情景例句
Please check to be sure you have your belongings.
请记得带您的行李。
We'll start with an orientation video. It runs about 15 minutes.
我们将从一个电视简报开始，大概放15分钟。
the varieties are infinite; but two classes may be roughly seen.
鸟的飞行方式千差万别，但大体上可分为两类。