IN VIRTUAL worlds you may be able to fly, but the laws of economic gravity still apply.
在虚拟世界中虽然人可以自由飞翔，但是经济规律却依然存在。
We digitally simulated gravity to make the grapes fall into this virtual basket, until they were closely packed.
我们精确地模拟了万有引力使得葡萄落入虚拟的篮子中，直到它们紧密地安插起来。
Based on the virtual work principle and thin plate theory, the mechanical performance of the moving paper under gravity was analyzed by nonlinear FEM.
根据虚功原理和薄板度理论，对纸张在自重作用下的静动力学特性作了非线性有限单元法数值建模。
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