Backdrafts
n. 倒转（回程）；反向气流
🗣️ 情景例句
Good afternoon, sir.
下午好。
It's impossible. You may notice that the cost of raw materials has gone up in recent years.
不可能，您可能注意到了近年来原材料的价格上涨了。
May I have a look at it, please?
我可以看一看吗？