Motion, however, as the unity of time and space, is a connection which is purely abstract and external.
运动作为空间和时间的统一，然而事实完全外在的和抽象的关系。
It's necessary to pay attention to the unity of time and space for each particle velocity, when analysing the question for particle system use momentum conservation law.
利用动量守恒定律分析质点组问题时，必需注意质点组各质点速度的空间统一性和时间统一性。
Then, what makes the unity between primitive rock art and modem design across the time and distance of space?
那么，是什么让原始岩画艺术与现代设计之间在跨越了时间与空间的距离后得到了统一呢？
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