blue-sky

音标发音

The fig trees sway in the gentle Mediterranean breeze, cotton clouds scattered across the crystal blue-sky cast shadows over the plaza.
无花果树在地中海的微风中轻轻摇邑，棉花般的云朵散布在水晶般湛蓝的天空中，在广场上撒下一地斑驳。
But two U. S. researchers, a transportation expert and an atmospheric scientist, decided the time had come to apply blue-sky thinking to one of the world's greatest challenges.
但是来自美国的两位研究员，一位是交通专家，另一位是大气科学家，他们认为把蓝天思考纳入世界诸多重大挑战之一时候来到了。
Some of its work is truly "blue-sky" research.
他们的工作中有些是真正的“蓝天研究”，即没有直接实用价值的基础科研。

David Bishop, who heads micromechanics research, plied such blue-sky pursuits as superconductivity a dozen years ago.
FORBES: Lucent's Labs
PARCs to perform blue-sky investigative work, how are the frontiers of scientific exploration going to be expanded?
ECONOMIST: A new blueprint needed
The company had pursued blue-sky basic research more common to drug titans with staffs three times as large.
FORBES: Biotech Behemoth

using the imagination to think of ideas that do not yet have practical uses or make money

of or denoting theoretical research without regard to any future application of its result
to theorize (about something that may not lead to any practical application)