Dcf
[医] 直接离心浮选[法]
🗣️ 情景例句
There's nothing you can do about it.
你对此无能为力。
Does John have a yellow pencil?
约翰有一支黄铅笔吗？
There are many things to be learnt when you start working.
开始工作时，你有许多东西要学。