OK, so what a conservative field?
那么，什么是保守场？
So, in particular, only if you have a conservative field, a gradient field.
特别地，仅当是保守场，即有势场时才可以使用。
If you are working in a very conservative field, will others look at your tattoo in a bad way?
如果你在相当保守的领域工作，别人会不会对你的纹身有负面的看法？
Language testing research, a typical example of positivism, is usually considered the most conservative field in social science research.
语言测试研究被认为是社会科学研究中最保守的、最典型的现代主义实证研究。
The major results are:(1)the movement of high energy electrons in a powerful laser field is a conservative field movement, thus the condition for in-phase coupling is obtained;
主要结果是：①高能电子在高功率激光场中运动是一保守场运动，由此得到同位相耦合的条件；
Tip5: Summer legs. Okay, this is a topic many want to avoid and some will vehemently want to disagree. If you work in a conservative field and wear a dress or skirt, yes, stockings are important.
建议五：夏日美腿：这个话题不必避讳，如果在正式场合，长袜还是要穿的，尤其和裙子搭配。
So, this vector field is not conservative.
所以，这个向量场不是保守场。
Well, we've seen this criterion that if a curl of the vector field is zero and it's defined in the entire plane, then the vector field is conservative, and it's a gradient field.
我们已经知道了一个准则，如果向量场的旋度为零，而且它在整个平面上有定义，那么这个向量场是保守的，而且它是个梯度场。
And it is a gradient field in that part of the plane and conservative and so on. The answer for now is, in general, no.
在那部分平面上，梯度场，是保守的，目前来说结论一般是不对的。
See, if your field was conservative — 0 if a curl was zero then the right-hand side would just be zero.
如果场是保守的-，如果旋度是0，那么右手边的结果也会是。
OK, so the first property that I will have for a vector field is that it's conservative.
第一个性质是有一个向量场,它是保守的。
So, what that means concretely is if you have a force field that conservative, then you cannot build somehow some perpetual motion out of it.
具体来讲，如果你有一个保守力场，就不可能建立起永恒的运动。
Academic Macolm Gladwell, whose books have become required reading within the Conservative Party, says you need to put in this time over a decade to get to the top of your chosen field.
畅销书作家MacolmGladwell的最新著作最近在保守党内广为传阅，他在书中表明，在你选择的领域中若想达到顶级的成就，也许得付出超过十年的时间。
So, it's an example of a vector field that is not conservative.
这是一个非保守场的例子。
Well, you see, each of these guys is one of the things that have to be zero for our field to be conservative.
你看，这里每一项,场是保守的时，都是零。
If the curl is zero, and if the field is defined everywhere, then it's going to be conservative.
如果旋度为0，而且场处处有定义，那么它就是保守场。
The test that we saw last time saying, well, to check if something is a gradient field if it's conservative, 0 we just have to compute the curl and check whether it's zero.
由上次的测试可知，如果一个东西是保守的，要确定是不是梯度，我们只需要计算旋度，查看它是否是。
And that would be fortunate because if a curl is zero then your field is less conservative.
真是十分幸运啊，因为如果旋度是0，那么场至少是保守的。
So, to say that a vector field with conservative means 0 that the line integral is zero along any closed curve.
一个保守的向量场就是说,沿任意闭曲线的线积分的结果是。
One place where it comes up is when we try to understand whether a vector field is conservative.
当需要判断一个向量场是否保守向量场时,旋度也会派上用场的。
And, basically, we say that these properties are equivalent being a gradient field or being path independent or being conservative.
根本上说，以下性质是等价的，一个向量场是梯度场，等价于积分与路径无关，也等价于向量场是保守的。
So, if you have a gradient field, it's what's called conservative.
如果有一个梯度场，它也是一个保守场。
Our main concern so far has been to say if we have a conservative force field it means that the work of a force is the change in the energy.
目前为止，我们主要关心的是，如果在保守力场中，力所做的功是，能量的改变。
The AD played well with many of MoveOn's 3.2m members. But conservative pundits immediately attacked the network for questioning the integrity of a decorated field-commander in a time of war.
广告一出正中320万会员的下怀，然而保守派专家却立即攻击了网媒对战时授勋司令诚实性的质疑。
Additionally we will resolutely maintain our conservative and prudent fiscal management style low and predictable tax structure as well as level playing field for all.
此外，我们会坚决维持我们保守而审慎的财政管理方式、低水平而明确的课税结构，以及提供公平竞争的环境。
The city's conservative attitude toward urban design is surprising, given its reputation as an innovator, particularly in the field of technology.
城市中的保守态度认为城市设计是出乎意料的，鉴于其作为创新者的声誉，特别是在技术领域。
A decade after the dot-com boom pushed casual workplace attire into vogue, the conservative legal field is still slow to embrace the trend.
十年前，互联网的繁荣使得职场休闲装成为一种时尚；而在十年之后，保守的法律领域仍需要时间来接受这一潮流。
They directly participated the movement (such as SOMOPO) or was influenced that brought new style for then relatively conservative Japan art field.
直接参与运动(如东乡青儿)或受到影响，给当时相对保守的日本画坛带来了新风。
By constructing principal function of a charged particle in electromagnetic field and using conservative system's Lagrange equation two formulas in Maxwell's equations are induced.
构造了带电粒子在电磁场中的作用量，借助于保守力系的拉格朗日方程，导出了麦克斯韦方程中的两个式子。
According to the characters of the work of magnetic force, the concept of potential energy can be brought in the non conservative system-magnetic field.
根据磁力做功的特点，在非保守场———磁场中也可以引入势能的概念。
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