Arithmetic series
等差级数
🧩 词语组成解析
🗣️ 情景例句
If you can't handle this job by yourself, I'm just a phone call away.
若你不能自己处理这件事的话，就打个电话给我吧。
We are having a party and would like you to come.
我们要开派对，能请您光临吗？
I don't envy him his money problems.
我庆幸自己没有他那些金钱的烦恼。