the preview pane option 预览面板选项
In the left option pane, expand servers.
在左边的窗格中，展开servers。
You can also display them while reading mail in the bottom pane through a new option in the mail Preferences dialog box.
还可以通过Mail Preferences对话框中的新选项，在阅读邮件时，在底部面板中显示这些线程。
To import a sample, select the sample you want to import in the left pane and click the option import the sample in the right pane.
要导入示例，在左边的窗格中选择希望导入的示例，然后在右面的窗格单击Import the sample选项。
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