This downward movement forces the valve to move downward off its seat so that it opens.
向下的运动使气门向下移动离开气门座，气门被打开。
He quickly grasped a small tree By the side of the precipice and Began to move downward Bit By Bit.
他迅速抓住悬崖边上的一颗小树，一点一点向下移动。
The law shows that, along with the static pre-load increasing, the dynamical bending strength of concrete would go up to a peak value and then move downward to the static strength.
计算结果显示，不同细观骨料模型具有相似的规律，即随预静载增大，混凝土动弯拉强度上升，至一定峰值后回归到静载强度。
The law shows that, along with the static pre-load increasing, the dynamical bending strength of concrete would go up to a peak value and then move downward to the static strength.
计算结果显示，不同细观骨料模型具有相似的规律，即随预静载增大，混凝土动弯拉强度上升，至一定峰值后回归到静载强度。
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