Petrographical
a. 岩相学的, 岩类学的
🗣️ 情景例句
We will help your children in learning lessons in their free time.
我们可以帮助您的孩子在他们空闲时学习功课。
On a crowded train, one comes in contact with many people.
在拥挤的火车里面，会和许多人接触。
In the evening, the children come home from school.They arrive home early.
傍晚，孩子们放学回家。他们到家很早。