Modern pearly nautiluses, whose relationship to ammonites is much debated, have a similararrangement.

　　现代珍珠一样的鹦鹉螺跟远古鹦鹉螺的亲缘关系尽管还有待验证，但是现代鹦鹉螺也有类似的充气推进机制。

　　What ammonites-or, at least, some of them-ate became clear earlier this year when an X-rayshowed a small crustacean in the jaws of a species called Baculites.

　　鹦鹉螺吃什么的问题今年有了答案，x光显示杆鹦鹉螺的咽喉中有小甲壳类动物的痕迹。

　　But what ate ammonites has never been shown in such an unambiguous manner.

　　但是什么吃鹦鹉螺从来没有像现在一样模棱两可。

　　Some ammonite fossils have tooth marks that look as though they were made by hugereptilian predators called mosasaurs.

　　一些鹦鹉螺化石上有牙印，看上去仿佛是巨大爬虫类捕食者比如沧龙留下的。

　　Some appear to have been attacked by the beaks of other cephalopods.

　　有些牙印似乎是被其他头足纲攻击的痕迹。

　　And some seem to have been bitten by sharks.

　　有些牙印似乎是鲨鱼留下的。

　　On top of that, coprolites, as palaeontologists politely describe fossil faeces, have turned upwith ammonite shells in them.

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