そんなところから何かが出てくる”out of the blue”というのは知る由も無い、つまり予期できないということになります。 またこの”out of the blue”というのは 副詞的に使われる表現 で、他の副詞だと”unexpectedly”や”suddenly”が適切でしょう。

You're all alone now, you got to make your choice. Yo-oh out of the blue, yo-oh out of the blue. Yo-oh out of the blue, yo-oh out of the blue, back to nowhere. We got a chance now, times will be
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Out of the Blue. Out of the Blue is a 1980 film by Dennis Hopper and starring Linda Manz and Hopper himself. The film was inspired by Neil Young 's song My my, Hey Hey (Out of the blue), hence its title. It tells the story of C.B. a teenage girl with a passion for punk music and Elvis, growing up in a dysfunctional environment that soon gets

out of the blue translations: 出乎意料地;突然. Learn more in the Cambridge English-Chinese traditional Dictionary.
PEDIATRIC/NEONATAL CODE BLUE and RAPID RESPONSE 5. minute . TEAM DEBRIEFING GUIDE . Goal: Debrief completed after all emergency responses. Also debrief situations that 1) are outside the norm or offer an opportunity to identify system improvements. Any staff member may call for a debriefing. Hospitalis. t leads on acute care units; PICU/CV
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out of the blue example