Even though future changes are difficult to foresee and the farther ahead one looks the more blurred things seem, a general calculation is possible and an appraisal of distant prospects is necessary.

尽管往后变化难测，愈远看愈渺茫，然而大体的计算是可能的，估计前途的远景是必要的。

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But as NASA looks back at the Apollo 1 accident, it also is looking ahead to an uncertain future.

宇航局一方面回顾阿波罗一号的意外事件，另一方面也要面对一个前途未卜的未来。

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With this, they can shift their business focus from the rear-view mirror to an over-the-horizon radar that looks ahead to accurately anticipate future customer needs before anyone else.

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