For example, I may have someone who promises to pay me $1 in one year or in two years or three years.

举个例子,有人对我承诺,在一年或者两年或者三年内支付我一美元

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This is the present value of $1 in one time period, which I'm taking to be a year.

这就是一美元在一段时期内的现值,我只是将一美元持有一年

耶鲁公开课 - 金融市场课程节选

It contains an million tons of magnesium, 1,000,000 tons, which is more than has ever been produced in one year by all the magnesium plants in the world.

它含有一百万吨镁，一百万吨，那比我们每年世界各地,生产镁的工厂的总产量还要多。

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They did this in 1,800 elementary school children, so these are about eight year-olds.

于是科研人员给一千八百名,八岁左右的小学生分发疫苗

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And, likewise, there will be a test running from 1:05 to 1:55: two different tests of comparable difficulty. I did this last year, and the difference in the scores on all three tests 1% was less than 1%.

还有，测试的时间会是,从1点5分到1点55分，两个不同的测试,但是难度差不多，我去年这样做过，3个测试的分数的区别,不到。

麻省理工公开课 - 固态化学导论课程节选

Of course, the banker isn't going to give you $1 for something that is paying $1 in a year because the banker knows that $1 could be invested at the interest rate.

当然,银行不会因为某些东西,在一年内收益一美元,而给你一美元,因为银行知道一美元能在利率的基础上,用来投资

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