Plainclothesman
n. 便衣刑警, 密探
🗣️ 情景例句
Right.
对。
Better lose the saddle than the horse.
吃小亏占大便宜。
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。