Backward compatible
[计] 向前兼容
🧩 词语组成解析
🗣️ 情景例句
We are going upstairs to set up Grandpa's room.
我们要上楼收拾一下爷爷的房间。
That's a book.
那是一本书。
You're not busy doing anything, are you?'
你不忙，是吗？”