It can be a direct cause of death but is also the most important single risk factor for disease in young children.

它可以是死亡的直接原因，但也是导致幼儿患病的最重要的一个危险因素。

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It can be a direct cause of death but is also the most important single risk factor for disease in young children.

它可以是死亡的直接原因，但也是导致幼儿患病的最重要的一个危险因素。

youdao