关于如何解决这个问题，以往就有一些建议，包括使用人工智能系统来防止空中交通工具之间发生碰撞。
Past proposals to solve this problem have included artificial intelligence systems to prevent collisions between air traffic.
当看到这一点，并且意识到目前的气候变化以及燃油供应紧缺的现实，很明显是开始跳出原始框架来思考如何解决交通耗能问题的时候了。
With this in mind, along with the reality of climate change and tightening oil supplies, it is clearly time to start thinking outside the box on transportation issues.
当看到这一点，并且意识到目前的气候变化以及燃油供应紧缺的现实，很明显是开始跳出原始框架来思考如何解决交通耗能问题的时候了。
With this in mind, along with the reality of climate change and tightening oil supplies, it is clearly time to start thinking outside the box on transportation issues.
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