At one time or another, many of NASA's laboratories have studied solar sails.
某一段时间里，美国宇航局的许多实验室都在研究太阳帆。
Solar sails are not the quickest way to travel through space, but they are cheap.
利用几组太阳帆并非实现太空旅行最快捷的方式，但是它们的造价低廉。
Solar sails are not the quickest way to travel through space, but they are cheap.
利用几组太阳帆并非实现太空旅行最快捷的方式，但是它们的造价低廉。
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