例如，在过滤器表达式 $x[count(.|$y)=count($y)] 中（它是 XSLT 1.0 中执行一组逻辑乘操作的唯一简便方法）中，Saxon 只对 count($y) 求值一次。

For example in the filter expression $x[count(.|$y)=count($y)] (which is the only convenient way in XSLT 1.0 of doing a set intersection operation), Saxon will evaluate count($y) only once.

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它是一次唯一的实际体验。

It is a unique experience.

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天文学家们对日全食特别感兴趣，因为它是可以从地球表面看到的太阳日冕唯一的一次机会。

Total solar eclipses are of special interest to astronomers because it is the only time the sun's corona can be seen from the Earth's surface.

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