这些矿石中的一种负载石在漫长的地球演变过程中变成了具有磁场能力的块状的大型天然铁。
One of these was loadstone which is basically a chunk of naturally occurring iron which has somehow in the course of the earth’s long history obtained a magnetic orientation.
演变过程中的每一个阶段都需要经历漫长的时间来变得更加成熟和稳定。
Each stage in the evolution needs time to mature and settle.
当然，仍有些反对派认为所谓的“长期”用户实际上户龄还不够长，而脑瘤的演变却要历经极其漫长的阶段。
But there are yet still other critics who say the “long-term” users weren’t long enough, that tumors require even more time to develop.
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