当一个问题或状况未被解决时，可能需要一些新想法。表达 “blue-sky thinking（蓝天思维）” 就比喻这种 “放飞思绪、自由畅想、天马行空的思考过程”。

• The problem with the computer system won’t go away. We need some blue-sky thinking to fix this.
  计算机系统的问题不会凭空消失。我们需要从不寻常的角度思考，从而解决这个问题。
• We need some blue-sky thinking when it comes to our sales as they haven’t improved over the last years.
  谈到我们的销售业绩，还需要一些天马行空的想法，因为在过去几年里，销量一直有待提高。
• The team looked really stuck on their latest project, so the boss brought in a freelancer for some blue-sky thinking.
  看来这个团队确实被最新项目难住了，因此老板请了一位自由职业者来帮忙提一提奇思妙想。