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英语听力：自然百科 驼背鲸

Off the coast of Boston, scientists scan the horizon for something largehumpback whales. In the busy waters of the Stellwagen Bank, National Marine Sanctuary, whales must navigate around submerged fishing gear. And on the surface, collisions to the s

发表于:2019-01-22 / 阅读(88) / 评论(0) 分类 自然百科2009年
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