他转动门把手打开了门。

He turned the ___knob to open the door.

他摸到门把手上有一个小突起。

He felt a small ___knob on the doorknob.

远处那座圆形的小山丘是我们野餐的目的地。

That round ___knob in the distance is where we're having our picnic.

他揉了揉膝盖，因为感觉有点酸痛。

He rubbed his ___knee because it felt sore.