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Precious stones and metals have long held an attraction, sometimes a fatal one. The gem trade is a multi-billion dollar business, and precious stones are a highly prized commodity. This has helped some countries develop into success stories and has
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大家都知道人的正常体温是摄氏37度。可是，你们可知道，在不同的情绪下，人血的温度可能变得滚烫，或者变得冰冷。这当然是不可能的，只是形像化的
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