最近在看SAS Online Tutor for Base Programming,里面有教怎么添加缩写，以及修改、删除缩写，但是我按照说明却没办法把缩写删除，这是为什么呢？我只能添加和修改缩写，却始终找不到地方删除，难道是我安装的SAS不行么？

下附添加、修改、删除缩写的文字说明，求大神指点，谢谢~

To create an abbreviation,

• Select ToolsAdd Abbreviation.
• For Abbreviation, type the name of the abbreviation.
• For Text to insert for abbreviation, type the text that the abbreviation will expand into.
• Click OK.
  

To use an abbreviation, type the abbreviation. When an abbreviation is recognized, a tooltip displays the expanded text. Press the Tab key or Enter key to accept the abbreviation.

You can modify or delete abbreviations that you create.