鳍

His tail, from twelve to fifteen inches long, is flat and paddle-shaped, and covered with scales instead of fur as his body is.

它的尾巴呈扁平鳍状，12到15英寸长，被一层鳞状物所复盖，而不象其躯干那样上面长满了毛。

Then, with incredible gentleness for such an enormous creature, the larger manatee nudged the little one with her paddle-shaped flipper and pushed it to the surface beside me.

对如此巨型的动物来说，它简直太温和了，那只大些的海牛用她的桨形鳍将小的那只轻推至我旁边的海面。

He uses his paddle-shaped tail as a rudder to steer with, or, if he wants to put on a burst of speed, he may occasionally scull with ft, as if it were an oar

它用自己鳍状的尾巴作为控制方向的舵，或当它想突然增加速度时，有时可用尾巴划水，就仿佛后者是浆。

Marine worms resembling the sagittas but with a broader body and only one pair of lateral fins.

海洋蠕虫的一个属，与箭虫相似，但有较宽的身体及一对侧鳍。

The 2×390MW HRSG in Xiamen Eastern Power Plant for combustion engine works adopts the HRSG manufactured by Hangzhou Boiler Group Co., Ltd., which is characterized by three-pressure, reheats, without after－combustion, horizontal type and natural circulation. Since the full set of HRSG designing technology from the US NOOTER/ERIKSEN has been introduced, it matches with PG9341FA type gas turbine, adopting single-row frame construction, full suspension type, and in-line arrangement in the heating surface. The heat conduction components use gear screw finned tube, module type supply and positive pressure operation.

厦门东部燃气电厂2×390MW燃机工程的余热锅炉采用由杭州锅炉厂生产的三压、再热、无补燃、卧式、自然循环燃机余热锅炉，引进美国NOOTER/ERIKSEN公司全套燃气轮机余热锅炉设计技术，它与PG9341FA型燃气轮机相匹配，采用单排框架结构，全悬吊形式，受热面顺列布置，传热元件采用开齿螺旋鳍片管，模块式供货，锅炉为正压运行。

Furthermore, there is no noticeable enhancement in the heat transfer performance of CPL by using a pin fin block to form the grooved channels.

另外，使用针状鳍片来构成沟槽的设计并无法增进整个系统的热传能力，使用均热片则能有效的提升热传能力，在沟槽的侧面及底面使用粗糙面的设计亦能有效的增进整个系统的热传能力。

All creatures that are capable of motion move with four or more points of motion; the blooded animals with four only: as, for instance, man with two hands and two feet, birds with two wings and two feet, quadrupeds and fishes severally with four feet and four fins.

所有能够运动的动物都有四个或更多的运动触点；有血动物只有四个：像是，例如，人有两手和两脚，鸟有两翅和两足，四足动物和鱼各自有四足和四鳍。

Rest of airframe welded steel tube, with pilot and fixed fin at rear and engine and fuel tank at front, resting on two pontoons of rubberized fabric.

其余机身焊接钢管，与飞行员，在后方，发动机和燃料箱固定鳍在前面，胶布的两个浮筒休息。

Pliosaurs are thought to have been ambush predators, using their giant flippers to launch ferocious attacks.

上龙被认为是一种埋伏型猎食者，使用它们巨大的鳍状肢发动凶猛的进攻。

The author implies that which of the following was part of the long-standing view concerning pinnipeds?

问题是&作者暗示下列哪个观点是关于鳍足亚目动物的长期看法的一部分&。

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。