几十年来，毛皮贸易一直控制着海狸鼠的数量，但在20世纪80年代末，海狸鼠毛制品市场崩溃，导致这种猫大小的动物的数量疯涨。
The fur trade kept nutria in check for decades, but when the market for nutria collapsed in the late 1980s, the cat-sized animals multiplied like crazy.
几十年来，毛皮贸易一直控制着海狸鼠的数量，但在20世纪80年代末，海狸鼠毛制品市场崩溃，导致这种猫大小的动物的数量疯涨。
The fur trade kept nutria in check for decades, but when the market for nutria collapsed in the late 1980s, the cat-sized animals multiplied like crazy.
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