查询词典 motion

Cellulose triacetate or safety base completely replaced cellulose nitrate as the material used for motion picture film base by 1951-52, primarily because of flammability concerns.

三醋酸纤维素完全取代硝酸钾成为制作动画胶片的底片原料是大约1951-52年以后的事了，主要是基于硝酸钾易燃的考虑。

There are assumptions about aircraft's ground motion; one of those widely used is "the center of simultaneous turning of the airframe is the same as the center of curvature of the mass center's track".

对飞机的地面运动一直沿用瞬时转动中心等价于质心轨迹的曲率中心的假设。

The combined motion of grinding the transition arc maintains that the gyration center of the arc moves along the parallel line to the surface of the grinding wheel, and the gyration center of the oxide tool moves along the vertical line to the surface of the grinding wheel.

磨削刀片过渡圆弧时，过渡圆弧的回转中心到砂轮面的距离必须恒等于过渡圆弧的半径，磨削过渡圆弧的复合运动要保持过渡圆弧的回转中心沿平行于砂轮面的直线运动；刀片的回转中心沿垂直于砂轮面的直线运动。

Which of these modes correspond to the center of mass motion discussed in part a?

中讨论的质心运动相对应）？

Press the weights up over your chest in a triangular motion until they meet above the centerline of your body.

按重量超过了你的胸部在一个三角形的议案，直到他们符合上述的中心线你的身体。

In this paper it is shown that there are two vector constants of the motion for a charged particle in the central field of force.

证明了带电粒子在有心力场中运动时有两个守恒矢量。

This method is to compare the general motion of a rigid body with the force systems in space and the central axis equation of the force systems in space has been derived beforehand.

本文在此基础上，继续了这一工作，具体地给出了螺旋轴上每一点的矢径及坐标所满足的矢量方程和标量方程，即中心轴方程。

In this paper, Lagrange function and a Hami quantity are used to develop the equation of motion for a non-inertial system in the presence of central force field.

采用拉格朗日函数与哈密顿量来讨论非惯性系统在有心力场存在时的运动方程。研究结果表明，这一方法远比通常方法简单、方便

The coordinated and ordered motion of people's movements is controlled by the central nervous system.

人的运动系统的有序协调的动作，是由中枢神经系统控制的。

In this model, the small motion of the drum can be expressed by three translations of the centre of mass and three rotations about the inertial axes.

在这一模型中，筒体微振动的6个自由度以质心的3个移动和绕惯性轴的3个转动来表达；框架结构则按有限元法处理。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。