在菜单选项里新增了调节环境音效与脚步声的调节滑块。
Added volume sliders for ambient sounds and footstep sounds.
tn变量可以作为一个全局变量存储，可以在菜单选项被单击后访问。
The tn variable can be stored as a global variable that can be accessed after the menu options are clicked.
除了视图之外，每个透视图还可以在适当的地方有不同的工具按钮和菜单选项。
In addition to views, each perspective can have different tool buttons and menu selections as appropriate.
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