SSS 2011-11-02
时间：2011-12-02 05:44:59
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（单词翻译）
For many potential entrée animals this is one of the scariest sounds around. Scientists long thought the lion's distinctive1 roar was due to thick layers of fat inside the vocal2 cords. But new research suggests that it's not the fat that makes the roar, it's the shape of the vocal cords themselves.
Most animals have
triangular3 vocal cords. But the lion's
mighty4 pipes are square. Tigers' too. That square shape allows the tissue to withstand more stretching, which lets the big cats create louder roars using lower lung pressure. The finding is the journal Public Library of Science ONE.
When we say loud, we mean loud. Lion roars can travel over five miles, and reach up to 114
decibels5, which is as loud as a jet airplane taking off. The researchers suggest that the fat is there to cushion the cords, and to provide tissue for repair if the cords get damaged.
Understanding how that repair happens might help doctors fix damaged vocal cords in humans, too. Which would have to be called a roaring success.
Thanks for the minute. For Scientific American's 60-Second Science, I'm Rose Eveleth.
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