In the Pre-Qin period, different social groups made different studies of the historical ups and downs which had their own traits.
在先秦时期，不同的阶层分别对历史盛衰问题进行了探索，形成了各自不同的特点。
In the Pre-Qin period, different social groups made different studies of the historical ups and downs which had their own traits.
在先秦时期，不同的阶层分别对历史盛衰问题进行了探索，形成了各自不同的特点。
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