Stasium
静水池塘植物群落
🗣️ 情景例句
I'm Susan Stewart.
我是 Susan Stewart。
When the tree is fallen, every one runs to it with his axe.
大树一倒下，人人持斧来。
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。