It is vital to limit the risk of human exposure to the H5N1 virus and the consequent risk of an emergence of a new pandemic virus.
限制人类接触H5N1病毒的风险以及最后出现新的大流行性病毒的危险性是至关重要的。
But even the most experienced swimmers run the risk of hypothermia, which is why it's important for swimmers to limit themselves to short exposure.
甚至有些最有经验的冬泳者冒着低温症的挑战，所以限制他们冬泳时间是非常重要的。
Even the most experienced helicopter pilots need to be vigilant about this risk and limit their exposure to it.
即使是最有经验的直升机飞行员也需要警惕这种风险，对此做必要的限制。
There is no current research available that provides a safe limit for sun exposure to maximize vitamin D production that does not put the individual's health at risk for developing skin cancer.
现在的研究无法做出伤害人体的实验，以至于无法得出究竟多少的晒日可以尽可能产生维生素D而不至于对健康产生患皮肤癌的风险。
There is no current research available that provides a safe limit for sun exposure to maximize vitamin D production that does not put the individual's health at risk for developing skin cancer.
现在的研究无法做出伤害人体的实验，以至于无法得出究竟多少的晒日可以尽可能产生维生素D而不至于对健康产生患皮肤癌的风险。
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