Polymetallism
多本位制
🗣️ 情景例句
No, by train.
不， 坐火车。
Is it illegal to tap a telephone for the purpose of secretly recording a conversation?
为了秘密地录下谈话，在电话内装置窃听器是违法的行为吗？
We've got to report back to the head office.
我们还要回去向总部汇报情况呢。