Predicting the future is notoriously difficult.

众所周知，预测未来是非常困难的。

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Predicting the future is notoriously difficult.

众所周知，预测未来是十分困难的。

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Whatever the outcome of all these swings and roundabouts along with many more, the reason that deciding what to do with your life is so difficult is that it involves predicting the future.

不管上述列举事情的结果如何，不管这些事情周围还有多少其它事情，让你决定生活中应该做什么事情很困难的原因，是因为你必须去预测未来。

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Historically, predicting the future sales of compounds in clinical development is difficult to do.

FORBES: The Difficulties In Predicting Blockbuster Drugs

Predicting the future is never easy, and it's particularly difficult in the fast-paced world of videogames.

FORBES: The Future Of Videogames