subspace
/ˈsʌbspeɪs/noun
1
- Mathematics a space that is wholly contained in another space, or whose points or elements are all in another space【数】子空间。
2
- mass noun(in science fiction) a hypothetical space-time continuum used for communication at a speed faster than that of light（科幻小说中用于超光速通讯的）虚拟时空连续体。