上世纪六十年代末，斯图加特的城市规划者试图通过增加一条街道来缓解闹市区的交通拥堵问题。

In the late 1960s the city planners of Stuttgart tried to ease downtown traffic by adding a street.

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至目前为止，天光48工作队在夏末炎热的莫哈韦沙漠中的工作还在继续，他们正探索出一条这种未来飞机的设计之路。

So far, so good as the Skyray 48 team works through the late summer heat of the Mojave Desert as they continue blazing a trail with this futuristic aircraft design.

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Now, suppose I took this two paths, and I took -- couple them together with one the reverse of the other.

其中一条的方向反过来，这是初态，末态,路径1，先冷却。

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