Placuntitis
胎盘炎
🗣️ 情景例句
I can take the bus to work ...
我可以坐公共汽车上班……
You cannot judge a tree by its bark.
人不可貌相。
The further off this solid obstruction, the longer time will elapse for the return of the echo.
固体障碍物越远。回声返回所用时间就越长。