Often it helps to scan material quickly to get a sense of what the point is before really getting into it ; often it helps to look back over it after reading it to fix the main points in your understanding 通常，这样会在你深入理解之前帮你很快地流览材料以便弄清楚讲的是什麽；也会在你越读完之后帮你回顾以便在理解中确定主旨。
