Parallelosterism
同晶型组与化学成分的关系
🗣️ 情景例句
Sit down, sit down.
请坐， 请坐。
I leave the office at 7.
我七点离开办公室。
he always insisted that it should be written out in full.
但他还是坚持要求将信的全文写在信纸上。