Costless
a. 没有成本的, 不需花钱的
✅ 同义词
🗣️ 情景例句
Well, it's too bad that you have to go.
真遗憾，你要走了。
How long have you lived here?
你住在这里多久了？
I have a surprise for you.
我有一个意想不到的东西给你看。