当银河圣母公司为乘客提供地球大气层上空亚轨道的短途太空旅行服务时，太空冒险公司正计划把乘客送到更远的地方，提供更长时间的太空之旅。
While Virgin Galactic is offering quick sub-orbital jaunts to just over the Earth's atmosphere, Space Adventures is planning to take its customers even further, for longer.
墨尔本庞大的轨道电车网络大大降低了私家车在市中心的使用率，但是远郊地区却与其他大多数的澳大利亚城市一样，有着同样的基于私家车的交通结构。
Melbourne's large tram network has made car use in the inner city much lower, but the outer suburbs have the same car-based structure as most other Australian cities.
但是最近，公司已经开始计划更便宜的“亚轨道”飞行，在太空无际黑暗的边缘进行更短时间的冒险。
But more recently, companies have begun to plan more affordable "suborbital" flights—briefer ventures just to the edge of space's vast darkness.
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