If you make a mistake, you can use the usual keyboard shortcuts -- ctrl+z will undo your previous action while the backspace key will remove the element from the page.

假如您不小心写错或者画错了某些东东，您可以用常见的ctrl+z快捷键来撤销先前的操作步骤；用退格键可以移去您在页面上所作的注释。

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Now press Ctrl + Backspace to fill the selection with your pre-set Background Color.

现在，按Ctrl + Backspace将事先设置好的背景色填充到选区。

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To name a window, activate the window. Click Ctrl-a A (uppercase A, for "Annotate"), click Backspace as needed to elide any existing moniker, then type a meaningful name at the prompt

指定窗口名称的方法是，激活窗口，按 Ctrl-a A（大写的字母 A，代表 “Annotate”），根据需要按 Backspace 删除现有的名称，然后在提示上输入一个有意义的名称

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