名詞 blue-sky:

1. the sky as viewed during daylight
   同義詞：blue sky, blue, blue air, wild blue yonder

形容詞 blue-sky:

1. without immediate commercial value

blue-sky

adj.（形容詞）
Unrealistic and impractical:
空想的：不切實際的，理論上的：
例句：
blue-sky marketing plans; blue-sky corporate planners.
不切實際的營銷計劃；空想的公司規(guī)劃者