The two most memorable barricades which the observer of social maladies can name do not belong to the period in which the action of this work is laid.

观察社会疾苦的人可能会提到的那两座最使人难忘的街垒，并不属于本书所述故事发生的时期。

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What different kinds of traces can you find and what period and population of the site's history do they belong to?

你发现了哪些不同类型的遗迹，它们属于研究点历史上哪个时期和族群？

youdao

What different kinds of traces can you find and what period of the site's history do they belong to?

你能找到哪些不同类型的遗迹，它们属于研究点历史上的那个阶段？

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