中国企业在这样的条件下，面对环境的不确定性和复杂性，正在经历一个严峻的挑战。

Chinese enterprise under such conditions, facing the uncertainty and complexity of the environment, experiencing a severe challenge.

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但传统的PID控制由于控制对象和环境的不确定性，往往难以达到满意的实时控制效果。

But a traditional PID controller cannot obtain a good effect on real-time controlling, owing to uncertain controlled object and environment.

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然而，伯南克说未来环境的不确定性“相当高”，并且美联储的预测有被证明是太过乐观的危险。

Bernanke, however, said uncertainty surrounding the outlook was "quite high" and that there was a risk the Fed's forecast would prove too optimistic.

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