Decopper
除铜, 脱铜
🗣️ 情景例句
Especially when it comes to speaking in English and fortunately or unfortunately.
特别是要用英文来演讲，不知是幸运还是不幸。
Please turn in your paper before leaving.
请在离开前将论文交上。
Sorry, Mr. Wu. I was not here yesterday.
对不起，吴先生。我昨天没有来。