After years of heated debate, gray wolves were reintroduced to Yellowstone National Park.
经过多年的激烈争论，灰狼被重新引入黄石国家公园。
For example, gray wolves in the Western Great Lakes region breed in February to March, while gray wolves in the arctic may breed a few weeks later - in March to April.
比如，灰狼在西部大湖地区一般会在二月到三月繁殖后代而在北极的灰狼会晚上几个星期-一般是三月到四月。
Few gray wolves survive in Europe, though many live in Alaska, Canada, and Asia.
欧洲有少数灰狼，但多数生活在阿拉斯加、加拿大和亚洲。
Gray and her team first confirmed that all domesticated dogs trace their heritage back to gray wolves.
戈瑞及她的团队先是确认，所有家养狗都遗传自灰狼。
Gray wolves are their ancestors.
灰狼是狗的祖先。
Gray wolves are their ancestors.
灰狼是狗的祖先。
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