The living organisms somehow concentrated the minerals by biological processes.生命体通过某种生物过程聚集矿物质。Biological systems have been doing this for billions of years.生物系统亿万年来一直都是这样。Most young women feel a biological need to proc...
Dogs love splashing in mud and hippos wallow in it.狗喜欢在泥水洼里扑腾，河马则喜欢在其中打滚撒欢儿。They were more concerned about the dogs' welfare than a clean getaway.他们更加关心那些狗的安危，而非自己如何干净利落地脱身。Across the busy plaza, vendors sell hot do...