轻触

I tipped his hoof with the handle of a knife.

我用刀他的脚。

The cantilever taps across the surface with metronomic precision.But as it moves, it also behaves much like a tuning fork, producing overtones related to the fundamental vibration.

悬臂以精确的节奏过物体表面，而悬臂移动时，就像是一个音叉，会生与基本振动有关的谐音。