查询词典 dorsal fin

Any of various brightly colored fishes of the family Balistidae of warm coastal waters,having a roundish body and an erectile spine on the anterior dorsal fin that locks upright when the fish is threatened.

科的鱼，生长于温暖的海岸水域中，体型较圆，前部的前鳍有两根直立的硬刺，如果受到威胁，硬刺便直立不动

A simplified kinematic model on locomotion of the undulatory long dorsal fin propulsion is based on the the observation and experimental data.

在"尼罗河魔鬼"巡航游动试验的基础上，通过对鱼体几何形态和柔性长背鳍波动的运动学分析，建立了"尼罗河魔鬼"长背鳍波动推进的简化运动学模型，并利用大摆幅伸长体理论分析了长背鳍波动推进的水动力学特性。

Diamond Head is the name of a volcanic tuff cone on the Hawaiian island of O?ahu and known to Hawaiians as Lē?ahi, most likely from lae 'browridge, promontory' plus ?ahi 'tuna' because the shape of the ridgeline resembles the shape of a tuna's dorsal fin.

钻石头的名字是火山凝灰岩锥的夏威夷群岛的瓦胡岛和已知夏威夷作为Lēahi ，最有可能从角' browridge ，海角'加阿伊'金枪鱼'，因为形状的山脊线的形状类似于一个金枪鱼'县背鳍。

A primitive bony freshwater fish Amia calva of central and eastern North America with a long spineless dorsal fin .

弓鳍鱼北美洲中部和东部的一种原始，多骨的淡水鱼，具有长的无脊的背鳍

Gymnarchus niloticus ; long-based dorsal fin ; undulation ; kinematic model

尼罗河魔鬼；长背鳍；波动；运动学模型

The hy-dromechanical performances of the undulatory long dorsal fin propeller of Gymnarchus niloticus are estimated applying the large-amplitude elongated-body theory...

计算表明：&尼罗河魔鬼&在0.728～0.985身长／s的速度范围内，长背鳍波动推进的水动力学效率介于81.664％-86.420％之间，表明长背鳍波动推进游动是一种适应水中环境的高效游动模式。

Gymnarchus niloticus ; the long-based flexible dorsal fin ; undulation contour ; polynomial-fitting function ; MPF ; aquatic bio-propulsion

尼罗河魔鬼；柔性长背鳍；波动包络线；多项式拟合方程；奇鳍/对鳍推进；水下仿生推进

Any of several gregarious toothed whales of the genus Phocaena and related genera, of oceanic waters, characteristically having a blunt snout and a triangular dorsal fin.

鼠海豚一种鼠海豚属小型群集齿鲸，其共同特点是生活于海洋中，生有钝圆白的吻部以及三角形的背鳍

Porpoise Any of several gregarious toothed whales of the genus Phocaena and related genera, of oceanic waters, characteristically having a blunt snout and a triangular dorsal fin.

Also called sea hog 鼠海豚：一种鼠海豚属小型群集齿鲸，其共同特点是生活于海洋中，生有钝圆白的吻部以及三角形的背鳍也作 sea hog

Large elongate scaleless oceanic fishes with sharp teeth and a long sail-like dorsal fin.

细长的大型海生无鳞鱼，有尖牙和船帆形的长背鳍。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。