Recently, physicists trying to meld gravity and quantum theory, and so explain the nature of space and time, have begun to revisit this old question.
最近，物理学家试图把引力和量子理论融为一体，由此来解释空间和时间的性质，已经开始重新研究这个老问题。
In quantum theory, it's even less well defined: time doesn't even figure as something that gets measured.
而在量子理论中，时间更加无法定义：时间甚至不具有可以测量得到的特质。
According to quantum theory, the shortest moment of time that can exist is known as Planck time, or 0.0000000000000000000000000000000000000000001 second.
根据量子理论，能够存在的最小时间单位叫做普朗克时间，长度为0.0000000000000000000000000000000000000000001秒（一千亿亿亿亿亿分之一秒）。
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