在广义相对论中，时间被看作和长宽高一样的维度，并与它们构成了一个四维宇宙—被称作时空。
In general relativity, time is considered a dimension like height, width and depth, creating a four dimensional universe called space-time.
近几十年中物理学家们争先恐后进行理论上时光机器的研究，就证明《时间机器》关于四维宇宙中时光旅行的描写极具预见性。
Its description of time travel in a four-dimensional universe presaged the cottage industry in theoretical space-time machines that has sprung up among physicists in recent decades.
真实的宇宙是四维的：它有空间与时间的自由度。
It is as if the dreamer is floating free in his own universe.
真实的宇宙是四维的：它有空间与时间的自由度。
It is as if the dreamer is floating free in his own universe.
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