Accounting: Death and taxes are a sure thing.

会计：死亡和税收是无可回避的。

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But until Sunday's announcement, it wasn't clear to outsiders that the book was a sure thing.

但是不到星期天正式宣布，没有人敢打包票说，这本书就这么定下来了。

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And we're not the only ones. A new study shows that pigeons will also pass up a sure thing in the hopes of a big payoff.

一项新研究显示，鸽子也会为了获得更大的回报而放弃一些近在眼前的好处。

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But one thing is sure: foods like doughnuts and cupcakes are a big business.

VOA: special.2010.04.12

One thing I forgot is if any of you has a cellphone be sure put that number down.

我忘了一件事，如果你们谁有手机,记得把手机号码写下来。

麻省理工公开课 - 电影哲学课程节选

Let's do a little bit of algebra just to make sure we can find this thing.

我们不妨也佐以数学计算验证一下

耶鲁公开课 - 博弈论课程节选

Its acne drug Velac seemed a sure thing for federal approval following positive Phase III data.

FORBES

Thor: The Dark World, opening November 8, 2013, is less of a sure thing.

FORBES: Why 'Man Of Steel' And 'Thor: The Dark World' Are The Most Important Films Of 2013

The top receiver, West Virginia's Tavon Austin, is hardly a sure thing at 5 feet 8.

WSJ: Guards: Sexier Than You Think