句子由 when 引导时间状语从句，主句使用 may 表示可能性，who 引导定语从句修饰 those，结构工整且意境优美。
Sometimes, I find myself sitting by the windowsill, smiling foolishly to myself, lost in thoughts of the past. Hehe, the past can never return. The present, too, will one day become the past. Perhaps on some day in the future, I will sit here again, reminiscing about this very moment. There is so much reluctance to let go, unwillingness to part with every minute and second of now, and with every person around me...
Deep down, I fear loss. Time always flows swiftly, and every passerby in life repeats the cycle of arriving and departing. We know full well that separation is inevitable, yet we still cannot bear to part. Yes, it is merely a matter of timing; once determined, it cannot be changed. But why does everything always come and go? If they have come, why must they leave? Perhaps this is precisely where the preciousness of life lies! I console myself by saying "everything is up to fate," but what is fate? If there is true destiny, those who come would not leave. Those who leave simply mean the bond has ended. Hehe, this is nothing but a foolish self-deception.
What is missed will never come back... I am increasingly coming to understand the meaning of these words and gradually learning to cherish. Yet, thinking about it differently, what good does cherishing do? What must come will come, and what must go will go... But what matters is the process, isn't it? Do not let every person who enters your life leave with regrets. Hold onto this beauty, and do not wait until it is lost to realize its value...
When cherishing becomes a habit, those who depart may become the most beautiful memories.
有时候，我总会痴痴地坐在窗台边傻笑，回忆着过去。呵呵，过去的已无法重来，而此刻，终有一天也会成为过去。或许在将来的某一天，我也会再次坐在这里，回忆着此刻。太多的不舍，不舍现在的每一分每一秒，还有身边的每一个人……
内心深处，我恐惧失去。时间总是匆匆流逝，生命中的每一个过客，都重复着来了又走的轨迹。明知道总有一天会分开，却还是那么舍不得。是啊，这只是早晚的问题，既然已确定，便无法改变。可是，究竟为什么一切总是来了又走呢？既然来到，为何还要离去？或许，这正是生命的珍贵之处吧！安慰自己说“一切随缘”，可什么是“缘”？若真有缘，一切来了便不会走；走了的，便叫“缘尽”罢了。呵呵，这不过是傻子般的自我安慰。
错过的，就不会重来……我越来越体会到这句话的意义，渐渐懂得珍惜。可是换个角度想，珍惜又有何用？该来的总会来，该走的总会走……但是，重要的是过程，不是吗？不要让每一个走进你生命的人，带着遗憾从你的生命中离去。保留住这份美好，别再等到失去后才懂得珍惜……
当珍惜成为一种习惯，离去的人，也许就会成为最美的风景。