Two similar things; a pair.

一对，一双两个相似的东西；一对。

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He goes on to warn about the phenomenon of pair fatigue: When two programmers pair together, the things they notice and fail to notice become more similar.

接下来，他提出了关于结对疲劳现象的警告：当两个程序员进行结对，他们发现和无法发现的东西会变得越来越类似。

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The two are actually very similar, but each probably does certain things better than the other.

其实这两者非常相似，但是这两者在某一点上都做得比对方要好。

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Two things distinguish it from similar services like Instapaper and Read It Later: It provides an opt-in mechanism for readers to partially compensate creators for ads that get filtered away, and it places the highest premium on beauty and functionality.

FORBES: A big step toward a more readable Web

In these two otherwise similar countries, the pace of privatisation was one of the few things that differed.

ECONOMIST: The British army

"A grandmother in Louisville and a teenager in Silicon Valley might put the same two words in a search box, but they don't want similar things, " Nazem says.

FORBES: On The Cover/Top Stories