straight-line motion

The bearing may make the straight reciprocating main motion on the axis.

轴承可在轴上做往复直线运动.

This stone will do circular motion, rather than doing a straight-line motion.

这样石头就会做圆周运动, 而不是做直线运动.

This paper deals with the motion of viscous liquid column with finite length and two free surfaces in a vertical straight tube under the action of magnetic fields, numerical solution is obtained by the time-dependent method in a finite difference techniques.

本文研究了竖直管中有限长液柱的粘性流体在磁场作用下的流动状况，应用有限差分方法进行了数值求解。

Basset force and virtual mass force are on the same magnitude as Stokes force and are important for the motion of abrasive particles during the initial phase of particle movement in the convergent section and straight tube section of the nozzle.

当磨料颗粒在喷嘴的收缩段和直柱段中运动时，磨料颗粒所受的Basset力、虚拟质量力与Stokes力处于同一量级，对磨料颗粒的运动影响很大，不可忽略；

The steering gear is a device for converting the rotary motion of the steering wheel into straight-line motion ( of linkage).

转向器的作用是把方向盘的旋转运动变为连杆机构的直线运动。

The straight-line motion theory of vehicle on different kinds of flat ground was introduced, and the straight-line motion state of vehicle on different acting forces was analyzed.

介绍了车辆在不同种类平地上的直线运动原理，分析了在不同作用力下车辆的直线运动状态。