Mastering math is my target.
By doing math,
I gradully cultivate a love for it.
It is true enough that 
I can't understand math without doing it.
I can't do math without understanding it.
What I am studying recently is arithmetic series.
There are a variety of math subject about arithmetic series.
After finishing one part,
there are plenty of parts left.
Those parts are calling for me to understand and
give it a shot.
Understandness is not enough.
Most important of all, 
I have to do math by myself and answer correctly.
The process proves
I really know how to solve this kind of problem.