Imagine Chuck Yeager's nerve breaking the sound barrier.

回答: Sound barrier In wikipedia,xia232023-10-28 10:10:48

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It could happen at any Mach. -xia23- 给 xia23 发送悄悄话 xia23 的博客首页 (0 bytes) () 10/28/2023 postreply 10:46:43

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