Many people in their lifetime avoid or do not even seek to find the answer to that question.

许多人在他们的一生中都在逃避或根本没有去寻找过这个问题的答案.

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Tomorrow is the 70th anniversary of the birth of John Lennon. In his lifetime, during and after the Beatles, Lennon lobbied hard to question and change the status quo - sometimes in song.

明天将是列侬的70岁生日，他的一生中，无论是披头士时代还是乐团解散后，都致力于质疑和改变某些态度——有时是通过音乐。

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I am very sure that in my lifetime we will have a definitive answer to one question that has been debated, with little data, for hundreds of years.

我很有把握在我的一生中我们将由于数据很少几百年来一直以来被争辩的一个问题的确定答案。

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"I don't deny the debt is a serious and frightening thing for some people, but I do think it's important to get it into perspective in terms of the lifetime costs of what goes on and to ask the question of whether such an investment is indeed worthwhile, " he said.

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It walks you through a simple, question-and-answer format and provides estimates for both monthly and lifetime benefits across a range of ages.

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But then, as I thought about it more and more, I began to ask myself the question, who would become president first if this were to happen in my lifetime?

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