This can be quite useful when you want to control the visibility or availability of certain object references in templates.
如果需要在模板中控制特定对象引用的可见性和可用性，这样做非常有用。
This can be quite useful when you want to control the visibility or availability of certain object references in templates.
如果需要在模板中控制特定对象引用的可见性和可用性，这样做非常有用。
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