You can either read something many times in order to be assured that you got it all, or else you can define your purpose and use techniques which will assure that you have met it and gotten what you need.
你可以反复阅读一些东西，以确保你已经掌握了所有的知识，或者你可以明确自己的目标，使用一些技巧来确保你已经达到了目标，得到了你需要的东西。
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Yourself
Techniques
Time