Subadditivity
子[次]可加性
🗣️ 情景例句
I'm in the red again, would you mind lending me some money?
我又 囊中羞涩了，借点钱给我吧。
The sight of such a beautiful girl took Tony's breath away.
看到如此美丽的女孩，他目瞪口呆。
Why are you in here?
你为什么在这里呢？