Blue sky的意思

"Blue sky" 這個短語在英語中通常有以下幾個意思：

1. 晴朗的天空：指沒有雲或雲很少的藍天。 例句：It's a beautiful day with a blue sky and gentle breeze.

2. 創新或不受限制的思考：在商業或科技領域，"blue sky thinking" 指的是不受現有條件限制，自由想像和創新的思考方式。 例句：The team was encouraged to engage in blue sky thinking to come up with new product ideas.

3. 不切實際的或過於樂觀的想法：在某些情況下，"blue sky" 可以指那些看似美好但不切實際的想法。 例句：His plan to start a business with no experience and no funding was just a blue sky dream.

4. 法律術語：在法律中，"blue sky laws" 是指州一級的證券法規，旨在保護投資者免受欺詐。 例句：The company had to comply with both federal and state blue sky laws before offering its stock for sale.

請根據上下文判斷具體的意思。