Scrolling mouse wheel while holding the right mouse button to turn pages in reading pane.

在阅读区转动鼠标滚轮时按住右键不放可以前后翻页。

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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。

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Just above this are Reading and Discover buttons, which let you toggle between the reading pane and another that offers up recommendations.

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