The magnet creates a field that changes the polarity of a tiny, tiny portion of the metal particles which coat each platter's surface. 这个磁体创建一个磁场,能改变覆盖在磁盘表面的小金属粒子的极性。
There are impact factor to be discussed such as solvent polarity and nucleofuge. 准备讨论的影响因子包括溶剂极性和离核试剂。