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Internal forces at connections occur only as pairs of equal opposite forces.
节点内力总是成对浮现,其大小相等而标的目的相反.
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Everything lives with opposite forces. The same can be said about modern technology, such as Internet.
任何事情的存在都有负面影响. 可以说科技也是如此, 例如因特网络.
The simplest example of a force couple consists of two equal and opposite forces.
力偶最简单的例子包含两个大小相同、反向相反的力.
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