Two- and three-dimensional maps are helpful tools in planning excavations, illustrating how sites look, and presenting the results of archaeological research.

二维和三维地图是规划挖掘工作的有用工具，可以描绘遗址的外观，并展示考古研究的结果。

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But these three methods are very helpful in letting you know exactly what the problem is and where that problem occurred.

但是，这三种方法可以帮助您确切地知道问题是什么以及问题发生在何处。

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As a bit of helpful trivia, each application is initially opened with three file descriptors, 0 through 2, for the standard input, output, and error streams, respectively.

有一点不是很重要但却很有帮助，初始打开每个应用程序时，都具有三个文件描述符，从0到2，分别表示标准输入、输出和错误流。

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"What we can do is to take advantage of the three weeks left for a very helpful, very energetic American president that wants, that is eager to facilitate the Israeli-Palestinian peace, " he told CNN.

CNN: Mideast summit in Egypt called off

This came about as a result of a conversation that the President had with Speaker Pelosi, Majority Leader Reid, who --all three agreed that it would be helpful to have a few extra days here, talking to members.

WHITEHOUSE: Press Briefing

We decided that choosing gadgets in three "budget" ranges would be most helpful to you, the reader, and we've chosen a kit of gear we think any student would do well to grab up for each -- covering laptops, netbooks, mobile phones, e-readers, laptop bags, and so on.

ENGADGET: 's back to school guide