在一般XML文档中使用XML名称空间并不是最佳实践，事实上，这是一种代价高昂的实践。
The use of XML namespaces in general XML documents is not a best practice — in fact, it is a very costly practice.
空间天气也容易使石油天然气管道生锈—这是一个特别引人关注的问题。因为生锈的管道有时导致大量泄漏，破坏环境，代价高昂。
Space weather may also make oil and gas pipelines more prone to rusting - a particular concern because rusty pipelines sometimes spring leaks, creating costly and environmentally damaging spills.
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