但是光的新特性比单纯的推力要高级：光能产生这种更复杂的作用力-提拉力，很显著的例子是一个方向的光通量可以使物体垂直移动。
Light's new trick is fancier than a boring push: It created the more complicated force called lift, evident when a flow in one direction moves an object perpendicularly.
给出了作为影响电机轴系动力特性的主要因素之一的不平衡磁拉力及其刚度的计算方法。
The calculation method of the unbalanced magnetic pull and its stiffness which are the key factors influencing the dynamic characteristics of generator rotors is proposed in this paper.
本文根据不连续岩石梁的物理力学特性提出了无拉力岩石梁的力学解析模型。
A no tension rock beam model has been presented according to the mechanical behaviors of cracked roof beam in this paper.
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