The uncertainty inherent in life is a continuous threat that must be fought.

生活中的种种不确定因素是一种持续的威胁，必须要克服。

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He said the uncertainty is as much a threat to tobacco farmers as the proposed national settlement.

CNN: Clinton Visits The Heart Of Tobacco Country

As I write this on Day Six of the L.A. area manhunt, the terror enveloping the region is combined with anxious uncertainty over when the threat will finally be over and, more critically, whether the victim count will rise before the alleged assailant is found dead or alive.

CNN: In rampages, it's about revenge