Someone ( say), "Time is money."
But I think time is much important than money. Why? when money is spent, we can get it back later. However, time is gone, it'll never return. That is why we must not time.
It goes with saying that time is usually limited(有限的). Even a second is very important. We should make full use of our time to do something (use).But it is a pity that there are a lot of people who do not know the (important) of time. They spend their limited time (smoke), drinking and playing. They do not know that wasting time means wasting part of their own lives.
In a word. we should time. We shouldn't leave (today) work for tomorrow. Remember we must save time.
