虚拟单元法
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virtual member method
虚成员方法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
A class member, method, field, property, or event, on a derived class that is overriding a virtual member of the base class can declare that member as sealed.
若类别成员、方法、栏位、属性或事件是位于覆写基底类别虚拟成员的衍生类别上，则可宣告为密封。
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