英语阅读能力依靠什么？必然是词汇的积累，但，仅仅是词汇的积累是不够了，更应该了解英语句式，不同句型所表达意义。如何培养自己的阅读语感呢？那么就跟着聚创考研官网小编每天学一点英语，一起为考研筑起坚实的地基。阅读是需要积累的，就像我们需要经常和人沟通才会促进我们的表达能力一样~小伙伴跟着小编一起，每天坚持打卡，培养英语阅读能力及语感，了解文章一些经典词汇的用法。

经济学人：水珠在油面快速滑动的秘密（中）

And what they saw in these videos was that when the droplets were placed on the hot oil, they would propel themselves in random directions at very high speeds.Several things about this were very surprising.First, that the droplet propels itself. It was clear pretty quickly how this was happening.An easy way to think about this is it's called momentum transfer.So if you take a balloon and blow air in it, and you release it, the balloon just flies everywhere, right?Similar to the balloon, what was happening on the hotplate was that the oil was forming a thin layer around the drop.The oil cloak acts as the balloon. The water inside boils and turns into vapor.Eventually, this pocket of steam bursts through the oil, and much like letting go of the balloon this propels the drop.

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他们在这些视频中看到的是，水珠落到热油上时，会以极高的速度朝着任意方向散开。有好几个点令人惊讶。首先，水珠推动自身滚动。这是怎么发生的很快就清楚了。一个简单的理解方法，这是动量传递的结果。所以如果你拿一个气球，向里面吹气，然后放了气，气球就会到处飞，对吧?和气球类似，在加热板上，油会包住水珠形成薄薄的油层。油层就像气球一样。而里面的水沸腾后变成蒸汽。最终，这一团蒸汽会冲破油层，就像放手的气球一样，这推动水珠跑动。

The second thing that confused them was that the drops went much faster than those levitating leidenfrost water drops. Ten to 100 times faster, in fact.That was odd because the drop was still in contact with the oily surface.You might expect to slow it down compared to a levitating drop.And so we were pretty stumped because the velocity of the droplet actually seemed that it moving on an infinite pool of liquid.That is Leon who ran the experiments.
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第二件让他们困惑的事是，这里水珠运动的速度远超悬浮的莱顿弗罗斯特水珠。事实上，要快10到100倍。这很奇怪，因为水珠仍与油层接触。它的速度应该比悬浮的水珠低才对。我们被难住了，因为水珠的速度看上去就像是在无限的液体池上运动。做实验的是里昂。

He means that when he did the back calculations based on the speed that he saw the water drop was moving, the only way to make the calculation work out would be for the drop to be on an infinitely deep pool of oil.But in reality the oil was only 10 microns thick, which should cause the drop to stick--a lot.From a physics perspective the amount of friction the oil surface should have is based on its depth.Think of it like pouring honey out of a bottle.The thin film is like pouring through the small opening in the cap -- the honey moves very slowly.If you remove the cap entirely - the honey has less friction and pours more quickly.If you do the calculation for oil 10 microns thick the drop should move way slower.

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基于所观察到的水珠移动速度进行反向计算时，他发现唯一能让计算进行下去的情况是水珠运动在无限深的油池上。但实际上，油层只有10微米厚，这应该会使水珠黏住——牢牢黏住。从物理角度来看，油层表面摩擦力大小取决于其深度。将其想象成从瓶子里往外倒蜂蜜。薄薄的油层就好比通过瓶盖上的小孔往外倒蜂蜜——蜂蜜流动的速度非常缓慢。如果你完全取下瓶盖，蜂蜜流动时的摩擦力会更小，倾倒速度会更快。如果按照10微米厚的油层来算，水珠的移速应该更慢才对。

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