Mark tells them that it wasn't easy for him to trace the number because it came from a payphone.

Mark告诉他们查到这个号码十分不容易，因为它来自于一个付费电话。

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In addition, the new error visualization feature emphasizes schema validation problems and makes it easy to trace errors to their source, as shown in Figure 2.

此外，这个新的错误可视化特性强调了方案确认问题，并能轻松跟踪他们的源错误，如图2所示。

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If you have a Wacom or iPad, it's quite easy to trace some of your own photos or printed text in a manner that reflects this style.

如果拥有一部Wacom或iPad平板电脑，你就可以相当容易地描绘出你自己的图片或者某种意义上能够反映此类风格的书写文本。

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Flows of funds are never easy to trace, especially when their sources are keen to keep them quiet.

ECONOMIST: What might oil producers do with all that extra cash?

File-sharing systems, such as Kazaa, make it relatively easy to trace who is hosting which files by linking them to specific net addresses.

BBC: NEWS | Technology | Microsoft targets source pirates

He sat in his easy chair surrounded by books and enveloped by civilisation, but with no trace of that superiority that sometimes seems natural to Limeys.

ECONOMIST: Alistair Cooke