Ti is a ( )of time.

youth is not a time of life ,it is a state of mind

　　这个就是你想要的 原文+ 音频阅读资料

　　Samuel Ullman

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　　YOUTH
　　Youth is not a time of life; it is a state of mind; it is not a matter of rosy cheeks, red lips and supple knees; it is a matter of the will, a quality of the imagination, a vigor of the emotions; it is the freshness of the deep springs of life.

　　Youth means a temperamental predominance of courage over timidity of the appetite, for adventure over the love of ease. This often exists in a man of sixty more than a body of twenty. Nobody grows old merely by a number of years. We grow old by deserting our ideals.

　　Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul. Worry, fear, self-distrust bows the heart and turns the spirit back to dust.

　　Whether sixty or sixteen, there is in every human being's heart the lure of wonder, the unfailing child-like appetite of what's next, and the joy of the game of living. In the center of your heart and my heart there is a wireless station; so long as it receives messages of beauty, hope, cheer, courage and power from men and from the Infinite, so long are you young.

　　When the aerials are down, and your spirit is covered with snows of cynicism and the ice of pessimism, then you are grown old, even at twenty, but as long as your aerials are up, to catch the waves of optimism, there is hope you may die young at eighty.

　　http://www.wflms.cn/po46/web_manager/info/files/200901/141-20090105162126-643579039.MP3 (这个是 youth的音频资料， 如果你要下他这个直接复制到迅雷的新建里就好了)

时间讲求效率，你感兴趣的时候，他们找到了另外的人。（我只是意译啊）
理解：就是做事情要果断，就求效率，当断则断，不然机会就流失了。

lot

Abbreviation form

waste a waste of time固定搭配意思是浪费时间