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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First, the appearance of the modified do not use big, although big surrounded it looks cool, but modified overweight trace, often compare easy was investigated.

首先，外观上的改装尽量不要使用大包围，虽然大包围看起来很酷，但改装痕迹过重，往往比较容易被查处。

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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