学术界对旅游文化的认识经历了一个从模糊到清晰，从抽象到具体的过程。

The academia's understanding toward tourist culture has undergone a process, from the abstract to the concrete.

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因此，进口轴承的包装，无论是从线条到色块，都是非常清晰的，不会模模糊糊。

Therefore, the packaging of imported bearings, either from the line to the blocks of color, are very clear, not vague.

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