Dmf
[化] 二甲基甲酰胺
🗣️ 情景例句
You really don't look your age.
你看起来比你的年龄要年轻。
It is a long lane that has no turning.
路必有弯。
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。