Allenes
二烯烃
🗣️ 情景例句
Oh, I'm fine.
噢， 我很好。
It's snowing.
外面正在下雪。
The next morning, the box had disappeared but Mrs. Ramsay was sure that the kidnapper would keep his word.
第二天早晨，放钱的盒子不见了。但拉姆齐太太确信绑架者是会履行诺言的。