but the rocket failed
但是火箭失败了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Last year, in its most recent test, the X-51 fell for about four seconds before its booster rocket ignited, but the aircraft failed to separate from the rocket and plunged into the ocean.
MSN: Hypersonic aircraft taken out for a trial run on B-52 bomber
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