So the US turned the YF-12 into a reconnaissance plane (the amazing SR-71 Blackbird, which remained in service through 1998 and could traverse the US coast to coast in 1 hour).

因此，美国最终把YF - 12改成了侦察机(即令人赞叹的SR - 71黑鸟。它可以在一个小时内横穿美国东西海岸，直到1998年才退役)。

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Compared to the A-12, the SR-71 was larger, carried more fuel, and featured sharp sides to improve both stability and stealth.

相比a - 12, SR - 71体形更大，机载燃料更多，其具有特色的尖锐侧翼有助于提高稳定性和隐形能力。

youdao

In 1962, the first Blackbird successfully flew, and in 1966, the same year I graduated from high school, the Air Force began flying operational SR-71 missions.

1962年，黑鸟首飞成功；1966年(同年我高中毕业)，美国空军在常规任务中正式启用SR - 71。

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This flexibility has prompted the principal users of the SR-71 the Central Intelligence Agency, the Defense Intelligence Agency and the State Department to argue for retention of the SR-71.

CENTERFORSECURITYPOLICY: Center for Security Policy | Congress Must Preserve A Vital Strategic Reconnaissance Capability �� The SR-71

Currently, the fastest air-breathing aircraft is the SR-71, which accelerates to slightly over Mach 3.

BBC: Mach 10 scramjet prepares for launch

The SR-71 is the most flexible reconnaissance asset in the United States inventory.

CENTERFORSECURITYPOLICY: Center for Security Policy | Congress Must Preserve A Vital Strategic Reconnaissance Capability �� The SR-71