Unsaturated bond
[化] 不饱和键
🧩 词语组成解析
a. 没有饱和的, 不饱和的
🗣️ 情景例句
I think I have fallen in love with someone.
我恋爱了。
You were here in February,weren't you?
二月份你曾在这里，对不对？
Who was second? Who was third?
谁是第二？谁是第三？