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81. | their main window to display an even longer line of explanatory text associated with the currently selected |
| 许多程序也用主窗口最底端的状态栏来显示当前选择菜单项的解释文本,这种习惯用法可以增加命令向量的教育价值——如果用户知道如何寻找它,但其位置常常让人注意不到。 |
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82. | disable (make nonfunctional) menu items when they are unavailable in a given state or not relevant to the selected |
| 一个通行的菜单惯例是当菜单与所选数据对象或项目无关时,就禁止它(使其无效),菜单中的条目相对应的文本项变灰时通常表明已被禁止。 |
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