n.巨大；广阔；广袤
The vastness of London amazed him. 伦敦广阔的面积使他惊奇。
Observation was enabled to compass its vastness. 观察力却能够看透广阔的空间。
The vastness of space really boggles the mind. 太空之辽阔的确使人难以想像。
