Given a law of gravity and an assumption about how the matter is distributed, the next step is to work out the dynamics of the universe - how space and the matter in it evolves with time.
给出引力的作用规律和关于物质分布的假设后，下一步是得出宇宙的动力学规律——空间和质量如何与时间相互作用。
Since gravity is a property of space-time in General Relativity, this is equivalent to computing the dynamics of space-time itself. The story unfolds as follows.
由于引力在广义相对论中是时空的一个属性，所以上述过程相当于计算时空本身的动力。
In this paper, the dynamics of pubescent hornbeam populations in karst mountain of Guiyang are analysed by using the method of substitution of space for time.
本文试用空间差异代替时间变化的方法，分析了贵阳喀斯特山地云贵鹅耳枥种群的动态特征。
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