space-time
noun [ U ] physics specialized uk/ˌspeɪsˈtaɪm/ us/ˌspeɪsˈtaɪm/
时空(爱因斯坦相对论的部分内容,在三维空间上添加了时间)
the part of Einstein's Theory of Relativity that adds the idea of time to those of height, depth, and length
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