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托福听力练习-科学美国人60秒:大白鲨之吻

2017-06-09 09:27:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：大白鲨之吻

　　科学美国人60秒听力练习：大白鲨之吻

　　科学美国人60秒英文文本

　　Until a great white shark reaches about three meters in length, its jaws can't handle the kind of Spielbergian bite force usually associated with the killer fish. Cynthia Graber reports

　　除非大白鲨长到3米长，否则，它们的牙齿不能像斯在皮尔伯格的电影里那样，成为死亡象征。CG报道。

　　They’re everyone’s worst nightmare when it comes to swimming in the ocean: great white sharks. That’s despite the fact that the number of fatal shark attacks annually can usually be counted on the fingers of one still attached hand. But a new study finds that until great whites get at least three meters long, they’re less [Jaws music] and more [gentle music]. Because a full-force bite could wind up hurting them.

　　In research published in the Journal of Biomechanics [Stephen Wroe et al., article in press], scientists used 3-D computers models and advanced engineering techniques to study how sharks hunt and kill their food.

　　Great whites have jaws and teeth that are perfect for a powerful chomp on prey ranging from small fish to large marine mammals. But the researchers were surprised to find that a shark less than three meters long only looks like it could manage that killer bite. Because it hasn’t developed enough stiff, mineralized cartilage yet. A bite that would be lethal to a large marine mammal could damage the shark’s jaws.

　　The finding may explain why the few shark attacks that do happen on people are rarely fatal—until it’s pretty big, the great white’s reputation is worse than its bite.

　　—Cynthia Graber

　　中文翻译请点击下一页

本文关键字: 托福听力 科学美国人60秒

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