The longest previous hypersonic scramjet flight test, performed by a NASA X-43 in 2004, was faster, but lasted only about 10 seconds and used less logistically supportable hydrogen fuel.
先前最长的冲压式喷气发动机下极超音速飞行测试，是在2004年由NASA的X-43进行的，速度更快，但只持续了10s。
According to the Sunday Times, a study carried out by the Center for Work-Life Policy has revealed that 43 per cent of university-educated women from Generation X were child-free.
据《星期日泰晤士报》的报道，工作-生活政策中心开展的一项研究显示，X一代人中受过大学教育的女性有43%都没有孩子。
The Automotive X Prize is focused on developing a vehicle that can get 100 miles per gallon, or 43 kilometers per liter.
今年的汽车X奖侧重于开发每加仑汽油能跑100英里或每公升汽油能开43公里的汽车。
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