Backflow
n. 逆流, 回流\\n[医] 回流, 反流
🏥 医学释义
回流，返流
🗣️ 情景例句
I hate to bring this up, but this is a nonsmoking zone.
对不起提醒一下，这儿是禁烟区。
It's very nice of you to come and see me off.
您来给我送行，真是太客气了。
I know-it's you!
我知道－是你。