But we collected more hypersonic flight data than in 30 years of ground-based testing combined.

但我们也收集了比过去30年间地面测试总和还多的数据。

But some dreamers suggest hypersonic passenger flight might eventually be possible.

但一些梦想家认为，高超音速客运飞行最终可能是可能的。

The navy's engineers, it seems, are trying to revive an idea that might make hypersonic flight easier to achieve, but which was tested and then abandoned more than half a century ago.

看来，美国海军的工程师们正试图复兴一种可能让高超音速飞行更容易实现的想法，但这种想法在半个多世纪前经过了测试，然后被放弃了。