up-and-down motion

英 [ʌp ənd daʊn ˈməʊʃn]

美 [ʌp ənd daʊn ˈmoʊʃn]

网络垂直方向往复运动

The connecting rod transmits the up-and-down motion of the piston to the crankshaft, which changes it into rotary motion.
连杆把活塞的上下往复运动传递给曲拐，从而将往复直线运动转变成旋转运动。
In addition to the up-and-down motion generated, surface waves also have a side-to-side motion.
除产生上下运动外，面波还会发生侧向移动。
Abrupt up-and-down motion ( as caused by a ship or other conveyance).
突然上下的动作（由船或其它运输工具引起）。
Keep a good distance between your skis, so you have room enough to work with both skis, and move your body up-and-down in a rhythmic motion.
两雪板间要保持适当的距离，以留出足够的动作空间，身体同时有节奏地上下起伏。
Using either a circular or jiggling, up-and-down motion, brush this area with your toothbrush.
牙刷以圆周或者上下簸动的方式来刷这块区域。
The power consumption Kp, mixing time Tm and Metzner constant K(?) of a rotating impeller with up-and-down motion were measured for mixing highly viscous Newtonian and non-Newtonian fluids under a laminar regime.
用回转兼上下动搅拌器混合高粘度牛顿流体和非牛顿流体时，在层流域测定了功率数KP、混合时间TM和Metzner常数KS。
Recent up-and-down ground motion in Kunming area and its analysis
昆明地区近期地面垂直升降运动及分析