Prepollution
初期污染
🗣️ 情景例句
He married a classmate from high school.
他与高中时代的同班同学结婚。
In secondary school, children study mathmatic、phsicas and chemistry.
中学的小孩会读到数学、物理和化学。
We have a problem with your order.
你订的货有点问题。