Ethinylation
乙炔化
🗣️ 情景例句
That's Mr. Steven Lu, from Taipei?
您是Steven Lu，从台北来的？
Bye! Have a good day.
再见！请慢走！
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。