不像乌贼，鹦鹉螺有保护壳。
鹦鹉螺不能完全缩回外壳内自卫。
Since ammonites could not withdraw entirely into their shells for self-defence.
鹦鹉螺既是捕食者也是猎物。
黄色的部分则是鹦鹉螺牙齿的残留部分。
根据最近的鹦鹉螺的记载，鲨鱼的威胁无时不在。
According to the latest Scallop Poll, fear of sharks is at an all - time high.
这幅图片向我们展示了一枚鹦鹉螺的最后一次进食。
根据最近的鹦鹉螺的记载，鲨鱼的威胁无时不在。
鹦鹉螺采用开放式架构设计，支持采用新型元件和技术升级。
The Nautilus USES an open architecture to support replacement components and newer technologies.
结果就像画廊里所展出那张“彩色鹦鹉螺”一样，是值得的。
But the results, like the nautilus in the photo gallery that accompanies this piece, are worth it.
在拥挤的海面和水中航行时，鹦鹉螺显示器增强了船的安全性。
The Nautilus enhances ship safety during surfaced and submerged operations in crowded waters.
鹦鹉螺之眼。这种没有透镜结构的瞳孔更像是针孔相机的孔。
The eye of a nautilus mollusk. The lens-less pupil works rather like the aperture of a pinhole camera.
鹦鹉螺化石，这些螺旋状的贝壳，经常分布在二叠纪的化石群中。
Ammonoids, with their tightly coiled, spiral shells, are also widespread in the Permian fossil record.
是一种比鹦鹉螺类软体动物更复杂的眼睛，工作原理像是针孔相机。
The snail's eye, a more sophisticated version of that of the nautilus mollusk, works rather like the aperture of a pinhole camera.
有些鹦鹉螺化石上的齿痕看起来好像是由巨大的爬虫类捕食者沧龙留下的。
Some ammonite fossils have tooth marks that look as though they were made by huge reptilian predators called mosasaurs.
现代的珍珠鹦鹉螺与古鹦鹉螺的关系备受争议，但它也有类似的结构安排。
Modern pearly nautiluses, whose relationship to ammonites is much debated, have a similar arrangement.
高音采用了B&W的鹦鹉螺管装的设计，很好地遏止共振并增强高频表现。
The tweeters feature B&W's Nautilus tube-loaded design claimed to dampen resonance and improve high-frequency sounds.
这样的结构具有中性浮力，使得鹦鹉螺能够靠后推力移动（像枪乌贼一样）。
The result had neutral buoyancy, allowing the animal to move (like squid) by jet propulsion.
1954年：美国第一部原子潜艇“鹦鹉螺”号于康乃迪克州哥顿市启航。
In 1954, the first atomic submarine, the us "Nautilus," was launched at Groton, Connecticut.
直形壳鹦鹉螺类化石产出状态的研究等表明三道坎组古流向是自北而南的。
Study of the attitudes of the fossil orthocone nautiloids indicate that the paleocurrents were from north to south during the deposition of the Sandaokan Formation.
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 ammonite fossils have tooth marks that look as though they were made by huge reptilian predators called mosasaurs.
作品的主题包括一张女性脸庞、一个跳舞者、一只海豚、一只鹦鹉螺壳和太阳。
Motifs include a woman's face, a dancer, a dolphin, a nautilus shell and the sun.
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。
That a shark with teeth like this would try to make a meal of an ammonite is, at first sight, odd.
鹦鹉螺还能抵抗撞击、振动、防盐防雾、防渗水并能经受噪声和电磁干扰的影响。
The Nautilus meets withstands shock, vibration, salt, fog, drip, fungus, acoustic noise, and EMI.
结果就是鹦鹉螺有浮力，让其像喷气发动机推进一样的运动，这点跟乌贼一样。
The result had neutral buoyancy, allowing the animal to move by jet propulsion.
有关四腮目头足类的，以两对腮为特征，并包括有腔鹦鹉螺和许多化石的种类。
Of, relating to, or being a cephalopod of the order Tetrabranchiata, characterized by two pairs of gills and including the chambered nautilus and many fossil species.
除此之外，被古生物学家委婉地形容成粪化石的粪便化石中也找到了古鹦鹉螺的壳。
On top of that, coprolites, as palaeontologists politely describe fossil faeces, have turned up with ammonite shells in them.
鹦鹉螺架构的20米长的主体结构是构建在周围石堤墙的基础上的，但又没有完全碰触。
The 20 meter long primary structure of Nautilus is constructed over and around the stone embankment wall, but does not touch it.
即使经济上的问题堆积如山，鹦鹉螺与海王星公司仍必须克服人们对于环境破坏的关注。
Even if the economics stack up however nautilus and Neptune must overcome concerns over environmental damage.
即使经济上的问题堆积如山，鹦鹉螺与海王星公司仍必须克服人们对于环境破坏的关注。
Even if the economics stack up however nautilus and Neptune must overcome concerns over environmental damage.
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