特别地，一个没有旋度的力场，就是一个不产生任何旋转运动的力场。
In particular, a force field with no curl is a force field that does not generate any rotation motion.
关于旋度的更多介绍，设有一速度场，我们知道旋度是测量旋转影响的。
More about curl.If we have a velocity field, then we have seen that the curl measures the rotation affects.
假如力场中某处有一小块固体，旋度度量的是固体在力场中的旋转程度，在力场里来观察。
If you have a small solid somewhere, the curl will just measure how much your solid starts spinning if you leave it in this force field.
旋度实际上衡量的是，在任意给定点,运动旋转角速度的两倍。
The curl actually measures twice the angular speed of a rotation part of a motion at any given point.
具体来讲，想象一下，你要放东西在那里，如果是在一速度场内，旋度告诉你，在给定的时间他旋转的速度。
Concretely, if you imagine that you are putting something in there, you know, if you are in a velocity field the curl will tell you how fast your guy is spinning at a given time.
如果旋度是0，就意味着，这个力不产生旋转作用。
And if the curl is zero then it means that this force does not generate any rotation effects.
旋度会计算出，发生了多大的旋转。
And the curl will compute how much rotation is taking place.
而旋度度量了，运动中的旋转情况，这跟坐标系的选择有关。
And when I say that the curl measures the rotation in a motion, well, that depends on which coordinates you use.
旋度衡量的是,在某点上的旋转的程度。
And what a curl will measure is how intense the rotation effectis at that particular point.
我们知道旋度是度量旋转的，那散度表示什么？
I mean, we said for curl, curl measures how much things are rotating somehow. What does divergence mean?
这架代号为GEN H - 4的直升机有两个向相反方向旋转的旋翼，最高飞行速度可达每小时50公里。
The helicopter, named GEN H-4, has a set of two rotors turning in opposite directions and can fly at a maximum speed of 50 kilometres (31 miles) per hour.
它使用一个安装在后面的推进式螺旋桨并有一对一上一下反向旋转的主旋翼。
The X2 uses a pusher propeller mounted at the rear and has a pair of contra-rotating main rotors, one positioned above the other.
为了消除图像旋转对准确进行目标的自动识别和跟踪带来的影响，提出了一种基于FPGA的电子学消旋方法。
In order to eliminate the influence of image rotation on automatically recognizing and tracking targets, a method for canceling image rotation with electronics is proposed based on FPGA.
最后的设计具有一个主旋转器，也就是旋翼。
方钻杆旋转器已经很大程度地替代了旋链，而正是旋链造成了钻台上的大部分伤害事故。
The kelly spinner has largely replaced the infamous spinning chains, which were responsible for numerous injuries on the rig floor.
该预旋角情况下，进气雷诺数对盘面平均努赛尔特数的影响大于旋转雷诺数。
The cooling flow rate have more effects on average nu number than rotating speed in this pre-swirl Angle.
不旋转阀杆采用无旋流阀瓣，确保减少扭矩，防止填料受到扭转损坏。
Non rotating stem allows a non-spinning disc, ensures low torque and prevents torsional damage of the packing.
旋转的标志牌在风中打着旋儿。
The revolving sign was spinning round and round in the wind.
但是有时候，经过一段囊括大量腿向外旋转的练习(如很多站立体式)，在这个休息术里还是感觉腿内旋舒服。
Sometimes though, after a practice session involving lots of outward rotation of the legs (as for standing poses), it feels good to do this pose with the legs turned in.
本文设计的摄像头消旋平台能够隔离弹体的旋转运动，使摄像头采集回来的图像清晰稳定。
The rotation eliminated platform of camera designed in this paper is able to isolate the rotational motion of missile, clearing and steading the collected images.
在特定的物种中旋转的方向是恒定的，例如旋花科植物总是逆时针方向旋转。
The direction of rotation is often constant in a species; for example, Convolvulus always rotates in an anticlockwise direction.
该发动机主体结构为一内置有旋流燃烧室的高速旋转无叶无塞内燃转子，能融压气、燃烧和排气做功于一体。
The engines main body structure is an internal-combustion rotor, which has no blade and no piston but has an internal revolved stream combustor.
旋转机翼飞机是一种新概念飞行器，是旋翼飞行器和固定翼飞行器的结合。
Rotor wing plane is a new concept of aircraft, and is the combination of rotor aircraft and fixed wing aircraft.
尾旋特性分析及预测时所使用的动导数通常是在常规流场中获得的，测得的动导数没有体现旋转流场的影响。
The dynamic stability derivatives which are used for analysis and prediction the characters of spin are acquired in routine flow field usually, which has no effect of rotation.
虽然与直升机外观相似，但自转旋翼机必须依靠向上流过桨叶地气流维持旋翼地旋转，产生将飞行器维持在空中地升力以及向前飞行地推力。
While similar to a helicopter rotor in appearance, the autogyro's rotor must have air flowing up and through the rotor disk in order to generate rotation.
通过分析现有旋流筛在使用中存在的问题，研制了新型锥形筛面旋转式旋流筛。
A new type of conical rotating vortex screen is developed by means of analyzing the problems of current vortex screen.
旋转的标志牌在风中打著旋儿。
The revolving sign was spinning round and round in the wind.
旋转的标志牌在风中打著旋儿。
The revolving sign was spinning round and round in the wind.
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