第一，它大胆地替换了用户在桌面应用程序中常用到的聊天服务的类型。
First, it has the audacity to replace the type of chat service that users formerly expected in desktop applications.
拖放特性在桌面应用程序中非常常见，但是在Web应用程序不常见。
The drag-and-drop feature is something we have come to expect out of desktop applications, but it is not seen as often in Web applications.
在桌面应用程序中，就地编辑功能并不鲜见，但是到目前为止，这个功能在 Web 上还不多见。
Users now expect in-place editing from desktop applications, but this functionality is something rarely found on the Web, until now.
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