使这个问题复杂化的是，科学家们无法确定吃多少汞污染的鱼，才会触发健康问题。

Complicating this issue is that scientists are not certain how much mercury-tainted fish is needed to trigger health problems.

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中国快速工业化过程中的开矿等行为，使镉、砷、汞等有害重金属释放到自然界。

Mining and other activities during China's rapid industrialization have led to the release of hazardous heavy metals, such as cadmium, arsenic and mercury, into nature.

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