林先生是 New Link 的一名会计，他对当地一家报纸说：“如果困倦的时候使用计算器，我必须得复核一遍工作，以免出错。所以耗费的时间也就更久。”

Mr. Lin, an accountant at New Link, told a local newspaper: "If I use a calculator when I'm sleepy, I have to double-check my work for fear of making mistakes, so it takes longer."

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用在线计算器做一个“金钱的时间成本”的计算，然后告诉他当他用一张利息17%的信用卡时会有多少债务滚滚而来。

Use an online calculator to do a "time value of money" calculation that shows him how much debt you can run up when you're using a credit card that charges 17% interest.

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在这一部分中，您将扩展计算器样本来支持基于时间或预定的销毁。

In this section, you will extend the Calculator sample to support time-based or scheduled destruction.

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