鳍

Small marine soft-finned fishes with long silvery bodies; related to salmons and trouts.

小型海洋软鳍鱼类，体形较长，有银色光泽；与大麻哈鱼和鲑鱼有关。

These fishes have evolved into a stunning variety of species-more than 500 of which live in Lake Victoria alone.

这些鱼儿进化出的种类令人乍舌--仅在维多利亚湖里就有超过500种棘鳍类热带淡水鱼。

Mation, but it was by no means the only one. As tetrapods ventured onto

鳍转变为四足是一个重要的阶段，但是它并不以为是唯一的转变。

To the far right is the fish Elpistostege, an extinct relative of tetrapods.

它旁边的远处，另一条鳍鱼正准备离开这个危险的地方。

This group, the tetrapods, encompasses everything from birds and their

鱼类的鳍。今天四足生物这一种群包括了所有的一切，其中有鸟，他们的恐龙祖先变成了蜥蜴，蛇，海龟，蛙，哺乳动物

It's still a single overhead cam design and uses fins and air movement to keep things within operating temps.

它还是一个单一的间接凸轮的设计和使用鳍和空气流动，以保持内部经营的时代。

Completed early 1947 with long fabric-covered rear fuselage carrying twin-finned tail and tailskid.

1947年年初完成长布覆盖后进行双鳍尾和tailskid机身。

A single figure in each rises and pulls its dark hood over its smooth, finned head. One motions toward the dense swamplands to the east. The strange figures seem even more out of place silhouetted against their bulkier, less agile troll allies; yet their authority is unquestioned.

每艘小艇旁都有一个人影浮现，这些人影将黑色斗篷拉下，盖住那光滑且有鳍的头部，并向东边的沼泽方向做了个手势，这些带有黑暗力量的奇怪生物在型体上似乎跟他们巨大且笨重的洞穴巨人盟友格格不入，但是他们的影响是无庸置疑的。

A lagoon with blue-black water had sent fingers of streamlets in every direction, and in the shallower spots they had seen tiny fish with wing-like fins leaping from the water and taking to the air for several feet before splashing down once more.

和深蓝色的水一个咸水湖已经送每个方向的小溪手指，而且在更浅的地点中他们已经用从水跳跃而且为一些脚在下来再一次溅湿之前喜爱空气的像翅膀一样的鳍见到极小的鱼。

Two endplate fins and rudders, toed inward 15°; fixed horizontal stabiliser.

两个终板鳍和方向舵，脚趾向内15 °；固定的水平安定面。

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。