Replaceability
更换性, 可代换性, 替换性
🗣️ 情景例句
Have a good trip.
旅途愉快。
What time did you use to get up last year?
你去年时常什么时间起床？
We always enjoy ourselves, Mum.Bye-bye.
我们总是玩得很开心的，妈妈。再见。