对于某个主题，要非常深入的钻研，并用数年时间学习和理解，这样才能将其用来作为学习其他技能时的参照。
Going very deep into one subject, learning and understanding it over a course of several years, ACTS as a point of reference that is useful when we learn other subjects.
课外学习时间主要用来做作业和家庭作业，复习、补习和兴趣钻研。
The time is mainly used to do schoolwork and homework, revision, remediation and research.
经过我的刻苦钻研和学习，我已经把这个课题做完了。
I completed this subject paper with diligent research and study.
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