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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。

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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.

共同富裕的构想是这样提出的：一部分地区有条件先发展起来，一部分地区发展慢点，先发展起来的地区带动后发展的地区，最终达到共同富裕。Our plan is as follows: where conditions permit, some areas may develop faster than others; those that develop faster can help promote the progress of those that lag behind, until all become prosperous.