她正在清理墙上的油渍。

She is cleaning the ___grease off the wall.

轴承需要定期加润滑油以防止磨损。

The bearings need regular ___grease to prevent wear and tear.

他给门卫塞了点钱，好让他的车能停在禁区。

He tried to ___grease the guard's palm to park his car in the restricted area.