Olefine
[化] 烯烃; 链烯烃
🗣️ 情景例句
Notices are displayed on the bus asking people not to smoke.
公共汽车上张贴着请勿吸烟的公告。
If he doesn't help him, I will.
如果他不，我将帮助他。
The great advantage of taking medicine is that it makes no demands on the taker beyond that of putting up for a moment with a disgusting taste,
对服药人别无其他要求，除了暂时忍受一下令人作呕的味道外，