他心不在焉地凝视着虚空。

He was absent-mindedly gazing into ___space.

虚拟现实旨在让我们探索人工世界，超越正常的空间和时间。

Virtual Reality aims to give us artificial worlds to explore, outside normal ___space and time.

狮子在围栏里凝视着虚空。

The lion was staring into ___space in its enclosure.