Historically, a cornerstone of classical empiricism has been the notion that every true generalization must be confirmable by specific observations.
历史上，经典经验论立基于此一观念之上：每个真实的归纳命题必须能被个别观察所证实。
Heqing County, the north gate of Dali, is historically one of the flourishing commercial regions in Dali area and this is still true today.
鹤庆县是大理州的北大门，历史上就是大理地区商业活动较发达的地区之一，其经济活动到今天仍然比较活跃。
Heqing County, the north gate of Dali, is historically one of the flourishing commercial regions in Dali area and this is still true today.
鹤庆县是大理州的北大门，历史上就是大理地区商业活动较发达的地区之一，其经济活动到今天仍然比较活跃。
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