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.
结果表明：由浮力项、平流项和拖曳力项触发引起的扰动气压垂直梯度力与各对应源项具有同等量级，但与其源项的作用力方向相反。
The results show that the perturbation pressure forces induced by buoyancy, velocity advection and dray are of the same order of magnitude as the corresponding resource terms and act against them.
由扶壁、耳墙、胸墙组成的框架抵抗水平荷载，而以承台、桩基抵抗垂直及水平荷载的共同作用力。
The frame, which is formed by buttress, breast wall and side wall bear the horizontal loads, and group pile cap bears the resultant force of vertical and horizontal loads.
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