几十年来，研究者们一直担心北极动物，如海豹，白鲸，汞水平，北极红点鲑等动物的含汞量增加。
For decades, researchers have worried about rising mercury levels in Arctic animals, such as seals, beluga whales, and Arctic char.
几十年来，研究者们一直担心北极动物，如海豹，白鲸，汞水平，北极红点鲑等动物的含汞量增加。
For decades, researchers have worried about rising mercury levels in Arctic animals, such as seals, beluga whales, and Arctic char.
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