腹鳍

孵出后第30天，腹鳍芽出现；

By 30 days , the bud of ventral fin appeared ;

孵出后第49天，腹鳍形成；

By 49 days , the ventral fin formed ;

在腹鳍嵌入点之间的发光器的前面皮窗。

Anterior dermal window of light organ between insertions of pelvic fins .

某型飞机腹鳍故障攻关实例

The example of fixing the ventral fins breakdown on one type aircraft

想让飞机旋转，腹鳍转动与水平轴推向相反方向相反。

To achieve a spin , the fins go in opposite directions .

33天，20%的仔鱼可观察到腹鳍条；

And about 20 % of larvae having pelvic fin can be observed ;

多数细长的无鳞海水鱼，有大的胸鳍和退化的腹鳍。

Elongated mostly scaleless marine fishes with large pectoral fins and reduced pelvic fins .

小的蝌蚪形冷水鱼，长有形成吸盘的腹鳍；与圆鳍鱼科有关。

Small tadpole-shaped cold-water fishes with pelvic fins forming a sucker ; related to lumpfish .

每个轴控制着各自机翼上的腹鳍。

Each axis has its own set of fins built into the aircraft 's wings .

问题19如果飞行员想让飞机腹鳍转动，那么他应该做什么？

Question 19 . What should a pilot do if he wants the plane to spin ?

飞行员只需将腹鳍朝着目标方向推动。

a pilot needs only to turn the fins in the direction of the desired turn .

七彩的背鳍和腹鳍看上去是身体的一部分。

You can see that upper and lower fin " seems " like a part of the body .

左腹鳍会右转，这样飞机的左侧会上升。

The left fin would turn right , so that the left side of the aircraft would rise .

背鳍和腹鳍不包含鱼的尾巴，或者说，和尾巴离开一个很大的空隙。

The upper and lower fins don 't cover the tail or leave a big gap before the tail .

北大西洋中又软又粗身体笨重的鱼，长有用作吸盘的腹鳍；鱼子可制成鱼子酱食用。

Clumsy soft thick-bodied North Atlantic fish with pelvic fins fused into a sucker ; edible roe used for caviar .

头部与身体间的腹鳍已「肉质化」，使花跳能够爬行。

The abdominal fins between the head and body have already become " muscularized ," allowing the mudskipper to crawl .

皇室蓝：鱼身深蓝无杂色。有时腹鳍尖端有白或黑斑。

Royal blue : deep dark grain-flower-blue without other colour portions . The ventrals may have white or black peaks .

有些种类具双翼而仅胸鳍较大，有些则有四翼，胸、腹鳍皆大。

Two-winged species have only the pectoral fins enlarged ; four-winged species have Both the pectoral and the pelvic fins enlarged .

大西洋西部温暖水域的底栖鱼，身体扁平无鳞，靠胸鳍和腹鳍爬泳。

Bottom-dweller of warm western Atlantic coastal waters having a flattened scaleless body that crawls about on fleshy pectoral and pelvic fins .

腹鳍转动和推动方向相反。要操作横轴或者垂轴，

For a spin , the fins turn in opposite directions . To make a turn on the lateral or vertical axis ,

当飞行员移动气流中的飞机腹鳍时，腹鳍和气流相互作用以改变航向。

When a pilot moves the fins in the air stream , they react with the air pressure to turn the aircraft .

任一种蛇形的淡水鱼，体表光滑无鳞，有连续的垂直背鳍，缺少腹鳍。

Voracious snakelike marine or freshwater fishes with smooth slimy usually scaleless skin and having a continuous vertical fin but no ventral fins .

例如，想让飞机顺时针旋转，右腹鳍会下降，所以飞机的右侧会下降。

For example , to spin clockwise , the right fin would turn down , so the right side of the aircraft drops .

第三目是副鳍鱼，康塞尔说，腹鳍是接在胸鳝的下面和挂在肩骨上。

Tertio , Conseil said , the subbrachians , whose pelvic fins are attached under the pectorals and hang directly from the shoulder bone .

（鱼腹腔中的）黑膜海滨或半盐水中带棘鳍的小鱼，头大，身细长，有聚合成吸盘的腹鳍。

Small spiny-finned fish of coastal or brackish waters having a large head and elongated tapering body having the ventral fins modified as a sucker .

腹的发光器官相当大，在腹鳍基底之间位于而且与狭窄裸露的凹槽黑色肛门周围相连了；

Ventral luminous organ rather large , situated between pelvic bases and connected with black periproct by narrow naked groove ; lens faintly visible on photophore .

北部深海中庞大凶恶的食用鱼，牙齿有力，无腹鳍。大型远洋食用鱼，有细长的上颌和帆状的长背鳍。

Large ferocious northern deep-sea food fishes with strong teeth and no pelvic fins . large pelagic game fish having an elongated upper jaw and long sail-like dorsal fin .

康塞尔又说：第二目是腹鳍鱼，腹鳍是垂在肚腹下面和在胸绪后边，而不是长在肩骨上；

Secundo , Conseil went on , the abdominals , whose pelvic fins hang under the abdomen to the rear of the pectorals but aren 't attached to the shoulder bone ,

人类身体的腹部外表；肝脏的位置有点靠近腹部；与四足动物后肢相对的是腹鳍。

The ventral aspect of the human body ; the liver is somewhat ventral in position ; ventral ( or pelvic ) fins correspond to the hind limbs of a quadruped .

有灰色斑点的蓝白色暹罗猫。皇室蓝：鱼身深蓝无杂色。有时腹鳍尖端有白或黑斑。

Siamese cat having a bluish cream body and dark gray points . Royal blue : deep dark grain-flower-blue without other colour portions . The ventrals may have white or black peaks .