此方法有一个常见的用例，如下所述。说明下方的按钮使用示例值填充 API Explorer，或打开全屏 API Explorer 显示使用这些值的代码示例。如果您更改值，代码示例也会动态更新。

This example adds a reply to an existing comment. The snippet.parentId property identifies the top-level comment that you are replying to. That property's value specifies a comment thread ID. To add a top-level comment instead of a reply, use the commentThreads.insert method.