逻辑学是一门工具性科学，是思维主体必须学习的基础科学。

As a scientific tool and one of the basic subjects, Logic is a required course for all students.

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本篇是系列论文第三篇，紧扣广州人思维主体角色转换问题展开。

As the third one of a series of papers, this paper is on the issue of the conversion of Guangzhou peoples thinking subject role.

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然而，在思维主体里孕育观念之所以可能，仅仅是因为主体接触到世界。

But conception is possible in the thinking subject only because of the subject's encounter with the world.

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