宠物成群
Groups of pets
以上为机器翻译结果，长、整句建议使用 人工翻译 。
家中养的宠物，尤其是每天被拉出去遛弯的成群的宠物狗，总的来说他们是水污染的一个重要来源，专家们指出，甚至威胁到人类健康。
Household pets, particularly the legions of dogs taken for walks every day, collectively are a significant source of water pollution, experts say, and even a threat to human health.
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