The preparation method comprises rejuvenescence of the strain.
其制备方法包括菌种复壮。
The preparation method comprises: (1) rejuvenescence of the strain;
其制备方法包括：（1）菌种复壮；
The preparation method comprises the following operational steps: grinding metronidazole into powder, sieving;
其制备方法包括下 述操作步骤：将甲硝痤磨成粉末状，过筛；
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