在小部件公开某些能直接影响此标记的配置参数时，或是这个标记必须要依照外部首选项而有条件地生成时，这一点将会很有用。

This is useful when the widget exposes some configuration parameters that directly affect the mark-up or if the mark-up must be conditionally produced depending on external preferences.

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这项研究表示，65%的人认为他们没有达到完美的生活，因为他们没有条件这样做，而有38%的人认为他们没有时间。

The study shows that 65 per cent claim they don't live life to the full all the time because they can't afford to, while 38 per cent don't have the time.

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