Mopitt
abbr. Measurements of Pollution in the Troposphere 在对流层输送中污染治理方法
🗣️ 情景例句
Hi, Frank.
嗨， Frank。
Goodbye, it was nice meeting you.
再见，很荣幸认识你。
What was the population of the less developed countries in 1950?
1950年不太发达国家的人口是多少？