Bipositive
[医] 二正[原子]价的
🗣️ 情景例句
Please try to keep relaxed, sir.
别太紧张，先生。
Feel free to bring your brother if he would like to come.
如果喜欢的话，你不妨带令兄一起来。
Aren't you going to admire my new hat?
你难道不想夸夸我的新帽子吗？