fascinating!

回答: Yes. There is a case,xia232023-10-28 09:46:04

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Sound barrier In wikipedia, -xia23- 給 xia23 發送悄悄話 xia23 的博客首頁 (178 bytes) () 10/28/2023 postreply 10:10:48

Imagine Chuck Yeager's nerve breaking the sound barrier. -7grizzly- 給 7grizzly 發送悄悄話 7grizzly 的博客首頁 (0 bytes) () 10/28/2023 postreply 10:14:54

It could happen at any Mach. -xia23- 給 xia23 發送悄悄話 xia23 的博客首頁 (0 bytes) () 10/28/2023 postreply 10:46:43

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