摘要
美国政府已宣布计划把北极熊列为濒危物种,原因是考虑到它们的生存地上的冰块正在融化。美国政府所拟定的这个计划也有其它重要的原因。
The US government has announced plans to list polar bears as a threatened species because of concerns that the ice where they live is melting[融化的]. The US plans are also important for other reasons.
