appear out of the blue

更新日期：2026-08-14

词语	appear out of the blue
释义	appear out of the blue意想不到的事;意外地出现：Such an important technical innovation is actually made by a common young technician，it really appears out of the blue.这样一个重要的技术创新竟然是由一个普通的年轻技术人员做出，这真是意想不到的事。
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