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。

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。

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。

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。

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。

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）。

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