用move downward造句子，“move downward”造句

The rocker arm pivots around its supporting shaft so that the valve end of the rocker arm is forced downward. This downward movement forces the valve to move downward off its seat so that it opens.

move downward but not necessarily all the way.

He quickly grasped a small tree By the side of the precipice and Began to move downward Bit By Bit.

Over the next few weeks, however, prices began to move downward. And the lower they fell, the faster they picked up speed.