2015考研英语阅读牙齿的痕迹_大学英语阅读

　　That a shark with teeth like this would try to make a meal of an ammonite is, at first sight,odd.

　　长着这样牙齿的鲨鱼,会试图吃掉鹦鹉螺，美餐一顿的理论,乍一看有点古怪。

　　But second thoughts provide a possible explanation.

　　但想一想就有了合理的解释。

　　Ammonites manoeuvrability would have depended crucially on their buoyancy control.

　　鹦鹉螺的灵活性主要建立在浮力控制上面的。

　　Even a small puncture to the shell, which a pointed tooth would be well able to deliver,

　　即使是壳上的一个小洞,可能就是这样尖牙造成的,就会让水进入壳内,

　　would let the water in and cause that control to vanish.

　　鹦鹉螺从而无法控制浮力。

　　Since ammonites could not withdraw entirely into their shells for self-defence,

　　鹦鹉螺不能完全缩回外壳内自卫,

　　it would then just be a question of dragging the creature out of its chamber in order to eat it.

　　于是就很可能就会被从外壳中拽出，成了其他生物的美食。

　　And for that, sharp, pointed teeth are ideal.

　　这样说来，锋利的尖牙是完美的武器。

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