灰狼被重新引入黄石国家公园。
经过多年的激烈争论，灰狼被重新引入黄石国家公园。
After years of heated debate, gray wolves were reintroduced to Yellowstone National Park.
在美国怀俄明州黄石国家公园里，一只勇敢的野鼠与一头身量一百倍的郊狼对峙。
A courageous vole takes on a coyote a hundred times his size in Yellowstone National Park, Wyoming.
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