English-Hanzi/Sardines are very low in contaminants

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Because they are low in the food chain, sardines are very low in contaminants, such as mercury, relative to other fish commonly eaten by humans.

因为它们在食物链中含量很低,相对于人类常吃的其他鱼类,沙丁鱼的污染物含量非常低,例如汞。