Back Of A Tooth(齿背), 此释义来源于网络辞典。
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Not only do they have a sharpened peg of a tooth but their teeth narrow down to a razor sharp edge at the back making the tigers bite much more lethal.
它们不仅仅有锋利的三角状牙齿，而且背面向下逐渐收缩成剃刀一样锋利，这使得老虎的咬更加致命。
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