Precontamination
初期污染
🗣️ 情景例句
Good night.
晚安。
We aren't happy with the present situation.
我们不满足于现状。
Bill works harder than Joe and grows more flowers and vegetables, but Joe's garden is more interesting.
他比乔也更为勤奋，种植的花卉和蔬菜也更多，但乔的花园更富有情趣。