The May 25 attempt will be the only hypersonic flight attempt this fiscal year, a change from the original test plan, which was to fly once in December 2009 and three more times in 2010.
5月25日的尝试将会是本财政年内唯一的一次极超音速飞行测试，按照原计划，2010年将有三次测试，但计划有所改变。
The May 25 attempt will be the only hypersonic flight attempt this fiscal year, a change from the original test plan, which was to fly once in December 2009 and three more times in 2010.
5月25日的尝试将会是本财政年内唯一的一次极超音速飞行测试，按照原计划，2010年将有三次测试，但计划有所改变。
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