Northern right whales, hunted to near extinction, are the rarest of all large whales.
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Clark studies endangered northern right whales, whose habitat includes busy shipping lanes for the port of Boston.
克拉克的研究使北方右鲸濒临危机，其产地包括波斯敦港口的繁忙船运路线。
Northern right whales, hunted to near extinction, are the rarest of all large whales. Experts estimate that only several hundred exist in the wild.
鲸鱼图片美术馆。北方的脊美鲸，猎物接近消失，脊美鲸是全部的大鲸鱼中稀罕珍贵的。专家估计只有几百条存在于自然环境下。
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