According to feather element tree, the base level and base coordinate system are created, then we can choose them when we need them at any time.
根据特征元素树创建了基准面和基准坐标系，使我们很方便的在需要参照基准的时候来选取它。
Base on the crystal-field theory, all of the crystal-field potentials of 32point-group are given for family iron ions and the relationships of which with different coordinate-system are studied.
基于晶体场理论，系统地给出了铁族离子32个点群的晶场势，并研究了坐标系取法不同时晶场势的变化。
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