Precontamination
初期污染
🗣️ 情景例句
Will you be so kind as to help me out of the difficulty?
帮助我克服困难，好吗？
You think I was born yesterday!
我没那么笨！又不是三岁小孩。
What shall we do today? The weather's not very good.
我们今天该做什么呢？天气很不好。