Macrodemography
总体人口统计学
🗣️ 情景例句
There are many natural catastroophes occurring in nature.
自然界里有很多自然灾害发生。
Still waters run deep.
大智若愚。静水流深。
I left at 6:00 so that I could catch the train.
我六点钟出门，以便赶上火车。