鳍

Seals are pinnipeds, all of which are specially adapted to an aquatic lifestyle.

海豹属于鳍足类，他们都很适合水栖生活。

From their early evolution on land to their return to the sea, dolphins and other pinnipeds have survived in some of the harshest environments, yet still have managed to have fun.

从早期在陆地上的进化，再到回归海洋里，海豚和其它鳍足类动物在最恶劣的环境下艰难生存下来，但它们依然保持着乐观的天性。

But Demere, who didn't participate in the Nature paper, called the discovery exciting because it provides direct evidence for what early pinnipeds in the land-to-water transition looked like.

但是为参与发表在《自然》上论文的Demere称这次发现令人兴奋，因为它给早期鳍足动物在进行陆地-水过渡时期的样子提供了直接证据。

Its Arctic location was "completely unexpected" because most scientists believed pinnipeds evolved on the west coast of North America, Rybczynski said.

Rybczynski说，其北极地点&完全出乎意料&因为多数科学家认为鳍足动物是在北美西岸进化。

Australian "ranchers" have now adopted a technique that involves catching young bluefins, enveloping them in a huge net and dragging it slowly round the south seas for months while feeding them pilchards imported from west Africa.

澳大利亚的&大牧场主们&现在采用了一种捕捉幼蓝鳍金枪鱼的技术，是将它们围到一个巨大的网里并绕着南海缓慢地拖动几个月，同时喂它们从西非进口的沙丁鱼。

Australian"ranchers"have now adopted atechnique that involves catching young bluefins,enveloping them in ahuge net and dragging it slowly round the south seas for months while feeding them pilchards imported from west Africa.

澳大利亚的&大牧场主们&现在采用了一种捕捉幼蓝鳍金枪鱼的技术，是将它们围到一个巨大的网里并绕着南海缓慢地拖动几个月，同时喂它们从西非进口的沙丁鱼。

Dark blue gray on the back and on the upper part of the sides, silvery lower down on the sides, and below; the dorsal fin is plain gray, the rear margin of the pectorals with a very narrow pale edging.

其背上和身体两侧的上部是深蓝色的灰色腹部和身体两侧下面的部分是银色，背面的鳍是灰色，胸鳍后部边缘有很狭窄暗淡的边。

The b oilers adopt horizontal square duct with membrane tube walls laid around and hea t transfer surface of bare tubes, welded-fin tubes and spiral fin tubes.

两台 锅炉均采用直通卧式方烟道结构，烟道的四周为膜式水冷壁，受热面为38mm× 4mm的光管、双翅片管和螺旋鳍片管。

The additional fins on either side of the nosecone (2) now have a wing-shaped profile, which improves airflow efficiency between the chassis and the tyres.

鼻锥两端的小鳍（2）现在有了翼状的外观，可以增进车架和轮胎之间气流的效率。

The popular fin and tube type of radiator core has the advantage of fewer soldered joints and is there a stronger construction.

暖器炉核心的流行鳍和管类型有较少数的利益施以焊接了关节而且那里一个较强壮的建筑。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。