Prepollution
初期污染
🗣️ 情景例句
Good night, Dad.
晚安， 爸爸。
We want to strengthen our ties with the United States.
我们想加强和美国的关系。
Alpine village tended to be impoverished settlements cut off from civilization by the high mountains.
阿尔卑斯山山区的小村几乎全是高山环抱、与世隔绝的穷乡僻壤。