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本世纪初,已发现牛顿力学不够全面,它对于日常生活中所常见的运动物体是完全正确的,但对于高速运动(接近光速)的物体则不成立,因而必须用狭义相对论(1905年爱因斯坦
At the beginning of this century, it was found that Newtonian mechanics was not comprehensive enough. It was completely correct for the moving objects common in daily life, but it did not hold for objects moving at a high speed (approaching the speed of light) and thus must use the special theory of relativity (1905 Einstein