这种双重性质意味着对话框必须是紧凑和功能强大，快速而流利的，并且在使用上清晰和具有自我解释性。
This dual nature means that dialog boxes must be compact and powerful, speedy and smooth, and yet be clear and self-explanatory.
流利就是快速地和轻松地说英语和理解英语，而不去翻译。
Fluency is the ability to speak (and understand) English quickly and easily... WITHOUT translation.
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