Polytropy
多变性, 多变现象
🗣️ 情景例句
We'll open a letter of credit if you promise to effect shipment one month earlier.
如果你方答应提前一个月交货，我们就同意开信用证。
I took charge of the group.
我管理过那批人。
Fine, thank you.
我很好。谢谢。