Warning that the powerful poisons can endanger dogs and cats, the U.S. Environmental Protection Agency will require new instructions and labeling for on-spot flea products.
剧毒的药可能对狗和猫有害，美国环境保护署将要求局部涂抹的跳蚤药采用新的用法说明和产品标签。
The researchers warn that the amount of the poisons in the polar region is unknown and their release could "undermine global efforts to reduce environmental and human exposure to them".
研究人员警告称，冻结在极地区域的毒素数量不明，而这些有毒物质的释放会对地球环境以及人类自身安全造成极大威胁。
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