Microaggregate
微团聚体
🗣️ 情景例句
Let me hear it.
说给我听听。
Excuse me, but could you give me some change?
劳驾，你能换些零钱给我吗？
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。