They say their findings show that even low levels of smoke may cause behavior problems in children with asthma or others at risk.

VOA: special.2009.01.13

Presumably, these are activities that are all engaged in risk taking behavior of one kind or another that seem not to be able to be explained by Hobbes' law of nature alone.

大体来说，这些活动都,与冒险的行为有关,而这些行为并不能仅仅为,霍布斯的自然法所解释。

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