Having dealt with advanced mathematics for almost four years, the senior student has found his way to study the course.
他攻读高数近四年时间，如今正在读大四的他已经摸索到了高数的学习方法。
Having dealt with advanced mathematics for almost four years, the senior student has found his way to study the course.
他攻读高数近四年时间，如今正在读大四的他已经摸索到了高数的学习方法。
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