Backflooding
地下水逆流
🗣️ 情景例句
We're going to take it slow first.
开头我们要做慢一点。
Yes,I had breakfast two hours ago.
是,我2小时以前吃了早餐。
Here is a cheque for 4,725,466.
这是一张4，725，466美元的支票。