首先，对左手边的系统做功。
First of all, work is being done to the system on the left-hand side.
重要的是，这只是对做功来讲的。
很多勤劳工作者总是依赖别人对他们的价值做出表扬或嘉奖，而不是自己去做功课，明白自己的真实价值所在。
Many hard-working contributors tend to look to others to praise and reward them for their worth and may not do the homework to get real facts.
这里系统没有对环境做功，因为压强是零。
And there is no work done on the surroundings because pressure is zero.
对我而言就像当时做功课一样，但是真的有趣，我有点上瘾了，在去年的期末考试期间我还请教过。
Like homework for me at the time was actually fun; and there is some addictive about this; Tej and I even asked Tej during last year's final exam period.
热力学在问你们，到底是系统对环境做功，还是环境对系统做功？
Thermodynamics is asking you, what work does this thing do on the surroundings or the surroundings do on the system?
需要你做些功课，好在你对做功课已经是得心应手了。
Good thing you're used to homework, as you'll need to do some.
系统对环境做功，因此符号是负的。
So, the system does work on the surroundings, hence the minus sign.
那么对做功求线积分,就变成坐标积分,同时也有对通量求线积分的。
So, the line integral for work Mdx+Ndy becomes in coordinates integral of Mdx plus Ndy while we've also seen line integral for flux.
大家知道热量不会自发地，从冷的物理流动到热的物理，除非对它做功。
You know the heat isn't going to flow from a cold body to a hot body without putting some work in to make that happen.
如果我们对某一物体做功，能量守恒的原理告诉我们：所做的功全都必须以某种方式来产生的。
If we do work on any body, the principle of conservation of energy tells us that the work done must all be accounted for in some way.
好的，首先,我们通过左边对系统做功。
OK, so w, first of all, work is being done to the system on the left hand side here.
环境对系统做功。
我从前懒惰的儿子开始按时做功课，并且在学校的测验中取得了好成绩，我对他说：“棒极了！”
EXAMPLE: When my previously lazy son started doing his homework regularly and getting good scores on his tests at school, I said :"That's the ticket!"
吉姆：你说的对。我需要在这上面做做功课。
为了机器能做功，我们必须对它做功。
目的探讨不同位点组合同步心室起搏模式对慢性心力衰竭心脏做功效率的影响。
Objective To assess the effect of ventricular synchronous pacing modes with different pacing site combination on cardiac work efficiency (CWE) of chronic heart failure in pigs.
对这一地区的孩子们来说，大雪意味学校放假，打雪仗代替了做功课。
The snow meant a break from school for the region's children as classes gave way to snowball fights.
根据磁力做功的特点，通过对感应电动势与磁场能量变化关系的分析，得出磁力做功是磁场能量改变的量度、电磁感应现象是能量转换的过程的结。
According to the work of magnetic force, the relationship between induction electro motive force and the energy change in magnetic field is analysed.
既然对能下的定义是做功的本领，因此我们就用功的单位来计量能的大小。
Since energy is defined as the capacity to do work, we measure energy in units of work.
为了机器能做功，我们必须对它做功。
We may define the energy of anything as its capacity for doing work.
对采集到的信号做功率谱估计后，结合测量时的雷达参数和环境参数，就可以计算出被测目标的散射系数。
After the power spectrum estimation for the collected signals, the measured objectives 'scattering coefficient can be calculated out combined to the radar parameters and environmental parameters.
本实验观察短期连续服用前后，补充苹果酸对花样游泳运动员的做功能力及脑电指标的影响，为运动员和健康人体的服用提供科学依据。
The purpose of this experiment is to investigate the effect of supplying MA on the performance ability and EEG of synchronized swimmers, and to provide the scientific basis for the application of MA.
本实验观察短期连续服用前后，补充苹果酸对花样游泳运动员的做功能力及脑电指标的影响，为运动员和健康人体的服用提供科学依据。
The purpose of this experiment is to investigate the effect of supplying MA on the performance ability and EEG of synchronized swimmers, and to provide the scientific basis for the application of MA.
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