珍惜每一天，因为它再也不会回来了。
总之，我们应该珍惜时间。时间是有限的，所以是珍贵的。当它过去了就再也不会回来了。
In a word, we should save time. Time is limited and so, very precious. It will not return any more when it is gone.
它的珍贵，正所以是因为时间是不可逆的，一旦流走，就再也不会回来了。
It's precious, is it because the time is not reversible, once the flow away, they never come back.
它的珍贵，正所以是因为时间是不可逆的，一旦流走，就再也不会回来了。
It's precious, is it because the time is not reversible, once the flow away, they never come back.
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