The Selection object includes the TypeText method, which is used to pass a string of characters to the document at the current cursor location.

Selection对象有一个TypeText方法，用于在当前光标位置输入一个文字串。

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Depending on the selection (Source in this case), the number of options available changes on the menu that pops up when the user drops the cursor on the Diagram surface.

依赖于用户的选择(本实例中为Source)，当用户在图表上下移光标时，弹出菜单上可用选项的数量会随之改变。

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It shows HTML source of the current page, selection or an item under the cursor.

它显示的HTML源代码当前页，选择或一个项目下的光标。

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