Look at this rough drawing of one of them, one Chromosome about to divide into two.
看一下其中一条的草图，一条将要分裂成两条的染色体。
From the macro-view, the study should analyze the rough trend and direction of the evolvement, divide the style families, and construct the style systems.
古代公文文体的演变，既要从宏观上考察大致趋势和走向，划分文体族群，建构文体体系；
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