In an interview last year with The Economist, George Whitesides, chief executive of space-tourism firm Virgin Galactic, was placing his company in the latter category.
在去年接受《经济学人》采访时，太空旅游公司维珍银河的首席执行官乔治·怀特赛兹将他的公司归为后一类。
2
Virgin Galactic has since accumulated a number of commercial rivals in the space-tourism market.
银河维京的这一举动对他们在空间旅游市场上的竞争者们也开始有所动作。
3
The notion of spacetourism took hold in 2001 with a $20 million flight aboard a Russian spacecraft by Dennis Tito, a millionaire engineer with an adventurous streak.