略读不仅帮助你对将要阅读的东西有所了解，还帮助你读得快些，提高你的阅读理解力。

有些人以为男孩子考试成绩总是比女孩子好。然而，事实未必如此。

Skimming not only helps you get an overview of the reading material, but also increases your reading speed and improves your comprehension.

有些人以为男孩子考试成绩总是比女孩子好。然而，事实未必如此
Some people think (that) boys always do better than girls in the exams. This is not necessarily the case, however.

Skim and not merely help you to understand the thing that will read to some extent, still help you to read a bit faster, improve your comprehension of reading.
略读不仅帮助你对将要阅读的东西有所了解，还帮助你读得快些，提高你的阅读理解力。
Some people thought boy's marks of the examination were always better than that of the girl. However, the fact may not be like this.
有些人以为男孩子考试成绩总是比女孩子好。然而，事实未必如此。