In the 18th century, porpoises were described as so common they sometimes darkened the sea as they rose to draw breath.
在18世纪，鼠海豚被描述为非常普遍的，他们有时使海水变黑，因为它们生长是靠喘气。
In the 18th century, porpoises were described as so common they sometimes darkened the sea as they rose to draw breath.
在18世纪，鼠海豚被描述为非常普遍的，他们有时使海水变黑，因为它们生长是靠喘气。
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