Is the underlined part close in meaning to this? He cannot see his subjects from a big-picture perspective?
Only with the experience of different subjects can anyone make an intelligent choice of specialization in the first place, let alone be able to see his subjects in any kind of perspective.
The given text means: Only with experience in different subjects can one come to see these subjects in the proper perspective, which will then enable him to make an intelligent choice of specialization.
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The given text means:
Only with experience in different subjects can one come to see these subjects in the proper perspective, which will then enable him to make an intelligent choice of specialization.