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Those warning of the danger of easy availability of nuclear technology and of poor control of the former Soviet Union's nuclear weapons have experienced something similar.

那些曾对核技术获取之轻易和前苏联核武控制之糟糕的危险发出警告的人，有过与此类似的经历。

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The safety rules are simple, because as human beings, we have a built-in warning system that alerts us to predator danger.

这些守则很简单，因为我们人类有内在的预警系统告诉咱们远离危险。

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Scaffolding was erected to bar entry into the nave, and signs were posted warning of danger overhead.

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It was simply safer, from the point of view of survival, to hear rustling in the grass as a warning of danger.

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That is higher than normal but still well below the level that triggers a danger warning.

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