Ethylenic bond
[化] 烯键
🧩 词语组成解析
a. ethylene的变形
🗣️ 情景例句
So, you're an exchange student.
哦，你是一名交换学生。
Which one is more expensive?
哪一个是比较贵的？
As the play draws to its close, they wonder whether they will ever catch that last train home.
当戏快演完时，他们又为是否能赶上末班火车回家而犯愁。