动力马达：提供开门与关门的主动力，控制门扇加速与减速运行。

Motor power:open the door and provide the initiative, door control acceleration and decelertion operation.

真空伏辊空气动力性噪声是造纸机的主噪声源。

The aerodynamical noise of vacuum couch roll is the major noise source of paper machine.

推动欧元本周走强的主动力很可能是投资者对美元的情绪。

The main driver of euro strength this week is probably investor sentiment toward the dollar.

首先对昆玉河斜拉桥做了动力模态分析、反应谱分析、主塔及全桥稳定性分析等常规分析。

Firstly, Routine analyses such as dynamic modal analysis, response spectrum analysis, buckling analysis were used to analyze the bridge.

本文抓住刚体无滑滚动的运动学特征，通过分析主动力和静摩擦力各自的贡献，提出一种形象、直观的求解方法。

This paper grasps its kinematic traits and gives a specific and intuitionistic solution through analysing each contribution of main motivity and static friction.