delegate 作为属性，为什么要用weak修饰
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V-T/V-I If you delegate duties, responsibilities, or power to someone, you give them those duties, those responsibilities, or that power so that they can act on your behalf. 委托; 授权
例：
He talks of travelling less, and delegating more authority to his deputies.
他说要减少旅行，还有要授予他的副手们更多的权力。
3.
delegation N-UNCOUNT 委托; 授权
例：
He talks of travelling less, and delegating more authority to his deputies.
他说要减少旅行，还有要授予他的副手们更多的权力。
3.
delegation N-UNCOUNT 委托; 授权
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