Both spherical and regular crystalline forms are relatively rare.
球形的和规则的球晶形成相对来说很稀少。
Certain drugs are polymorphic, existing in amorphous or various crystalline forms.
某些药物有多种形态，可以非晶体形或不同晶体形存在。
The crystalline forms can be produced on a commercial scale and exhibit excellent stability.
所述晶型可以按商业规模制备并显示极好的稳定性。
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