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更新函数形式
What type of PR is this (这是什么类型的PR)
Which issue(s) this PR fixes(Optional) (这个PR 修复了什么问题 (可选择))
[virtual | override]
,modifiers
以及function body
的定义。What this PR does / why we need it (这个PR 做了什么/ 我们为什么需要这个PR)
现有的函数定义不完整,部分关键元素缺失。该PR修正了该问题。