blue sky

• 非正式表达，指清晰、乐观或理想化的愿景或想法，常用于商业或创意语境中描述不受限制的思考。

An informal expression referring to a clear, optimistic, or idealistic vision or idea, often used in business or creative contexts to describe thinking without constraints or limitations.

1. Clear weatherA1formal

   A sky that is clear and free of clouds, often associated with good weather.

   晴朗的天空

   • The blue sky made the day perfect for a picnic.
   • We could see the blue sky through the window.
   • The children played outside under the blue sky.

2. Optimistic or idealisticB2informal

   Used to describe ideas or plans that are creative, optimistic, and not yet constrained by practical limitations.

   乐观或理想化

   • The team had a blue sky brainstorming session for new products.
   • His blue sky proposal was exciting but unrealistic.
   • We need some blue sky thinking to solve this problem.