十五年的用法和樣例：
例句
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我學(xué)英文已有十五年之久。
I have been learning English (for) as long as 15 years. -
我花十五年工夫才發(fā)覺(jué)自己沒(méi)有寫(xiě)作的才能，但我無(wú)法放棄這一行，因為到了那時(shí)候我已經(jīng)太出名了。
It took me fifteen years to discover I had no talent for writing, but I couldn't give it up because by that time I was too famous. -
她當了十五年的訟務(wù)律師之後，擔任了御用律師。
After fifteen years as a barrister, she took silk.
