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Have you ever wondered if your diamond is the real thing or a fake? Aside from taking your ring in to the jewellery store, there actually are some ways you can tell yourself. We will show some of the2012-08-23 编辑：Amosway
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当雾霾降临到北京等亚洲城市的上空时，人们争相购买口罩。可是，在过滤微小的有害颗粒物方面，这些口罩究竟有多少效果呢？2014-10-15 编辑：wendy
