我们总是被告知时间是宝贵的，我们应该珍惜时间。尽管大多数人都知道充分利用时间的必要性，但是当我们开始我们的计划时，总会发现时间是有限的。

We are always told that time is precious so that we shall cherish it. Even though most of us know the necessity of making use of time, when we start our plans, we find that time is limited. Where has the time gone, we always feel confused about it. Actually, it is the lack of efficiency that makes people feel time is not enough. It is in need of improving efficiency. Most students can't focus their mind on study because they think of all kinds of temptations, such as delicious food and computer games. If they can finish task quickly, then they can do other things. It is the motivation to improve efficiency. 
我们总是被告知时间是宝贵的，我们应该珍惜时间。尽管大多数人都知道充分利用时间的必要性，但是当我们开始我们的计划时，总会发现时间是有限的。时间都去哪里了呢，我们总是感到困惑。事实上，正是缺乏效率才会让人觉得时间不够。我们需要提高效率。大多数学生无法集中思想来学习，因为他们会想到各种各样的诱惑，如美味的食品和电脑游戏。如果他们能快速完成任务，然后他们就可以做其他的事情。这是提高效率的动力。