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They rode with a little more energy. Here at last was a large group of people, one or more of whom might have seen a white man and a boy. Charles knew the odds against it but at least it was a crumb. Until now, they'd been starving. 他们骑马上路，稍微有了点精神。终于遇上了一大帮人，他们中也许有人会看到一个白人和一个孩子。查尔斯知道可能性很小，但至少有一丁点希望，在这之前他们连一点希望都看不到。

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As the tulip trades increased, regular markets were set up on the Stock Exchange of Amsterdam and other towns.当郁金香交易进一步发展，大家就在阿姆斯特丹股票交易所和一些城镇设立了固定的市场进行买卖。

Cave exploration, or potholing, as it has come to be known, is a relatively new sport. Perhaps it is the desire for solitude or the chance of making an unexpected discovery that lures men down to the depths of the earth. It is impossible to give a satisfactory explanation for a potholer’s motives.洞穴勘察，即人们通常所说的山洞探险，是一项比较新颖的运动。吸引人们到地下深处去的，也许是寻求幽静的愿望，也许是对意外发现的期求。要对洞穴探险者的确切动机作出满意的解释，是不可能的。

宇宙中的任何一个物体对另一物体产生一种拉力，这就叫引力，或（者）万有引力。但其拉力(引力)的强度取决于两个因素。Every object in the universe pulls on every other object. This is called gravitation, or gravity. But the strength of that pull--of gravity--depends on two things.

在这个问题上我重复了这么多遍以后，我今天实在不想再讲了。After repeating so many times on the question, I'm really very reluctant to talk about it any more today.