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"Organic agriculture in general is well suited to small-scale farmers because usually small-scale farmers do not have much cash to purchase external inputs, chemical inputs,pesticides, or chemical fertilizers."
VOA: standard.2010.04.11
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Of course in the reversible case, you're always pushing against an external pressure, which is essentially equal to the internal pressure.
当然在可逆的情况下，外压力，总是，等于内部压力。
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Because it's so important. And I should add and also under reversible work, where the external pressure is equal to the internal pressure.
而且我还要说应该在外部压强,和内部压强相等的,可逆过程中引入它。
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Zbigniew Lewicki, a specialist in American studies at the University of Warsaw, told the Polish Radio External Service that there is also concern about Russia's perceived attempts to increase its influence in former Soviet satellite states, including Poland.
VOA: standard.2009.09.17
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One thing that does matter to our base level of wellbeing which is external circumstance is democracy versus oppression.
对基础幸福水平很重要的一样东西,它是一个外在因素，那就是民主和压迫。
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We start at p1, V1. and p external is equal to zero.
从状态开始，外部压强为零。
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Because what we've done is we forced p, pressure here, to be equal to the external pressure.
因为这里我们让内部的压强，等于外部的压强。
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All right, let's take the example of, the extreme example, let's go to the extreme example where p external is really small.
好了，现在我们来，看一个，极限情况,当外界压强非常小。
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We have a weight on the piston, and that weight is chosen so that p2 it acts as though p external is equal to p2.
让活塞上放一重物，让它的效果刚好,等同于外压强。
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There is a lot of research showing how difficult it is to change happiness based on external factors.
很多研究表明,基于外在因素改变快乐很难。
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This is an example where the external pressure here is kept fixed as the volume changes, but it doesn't have to be kept fixed.
在我们举的这个例子中,外界压强不变，气体体积改变。
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This piston is being brought out, so we expect 0 the work to be negative, negative. And we start o V2 ut with zero volume. We end up with a volume p2 of V2, and the external pressure is constant to p2.
所以我们可以想象功是负的,开始的时候体积是,最终的容积是,外界的压力恒为。
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Here there's an expansion going on, so the system is doing work to the external world.
这里发生了膨胀,所以系统对外界做功，活塞被推出来。
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Each weighing, say, one 100th of the weight 1/100 needed to establish p external is equal to p1.
每颗重，比方说，使外压强,达到p1的重量的。
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Third,premise related to the first is opposed to happiness which is primarily function of external circumstances.
第三，这个前提与,与决定幸福的,外部环境无关。
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p We want p equal to p external for the entire expansion, p2 and p external is decreased steadily from p1 to p2.
在膨胀过程中保持p等于外部，外部p很快从p1衰减到。
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We're going to change the pressure above, Pext right now there's a p external, which is equal to p on the inside.
来改变外界条件，可以改变外界的压强，它将与气体压强p相等。
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