Polytropy
多变性, 多变现象
🗣️ 情景例句
If you have time around Christmas, please come to visit my family.
如果你圣诞节前后有空，欢迎到我家来玩。
How much is it by air mail?
航空信要多少钱？
The only thing to do was ask them to come half an hour later than the other guests.
唯一的办法就是请他们比别的客人晚来半小时。