求翻译：我过去曾经有个计划：在一定的时间内看完一本数学书。在第一天，我严格按照自己的计划执行，但是到第二天，我就因为别的事情而没有如期完成计划，第三天，我就已经放弃了。我实在是搞不懂怎样才能严格地执行计划是什么意思？

I used to have a plan: at a certain period of time to finish reading a math book. On the first day, I strictly according to its own plan, but the next day, I was not completed because of other things planned, the third day, I had given up. I really do not understand how strictly to an execution plan