默认情况下，只会有一行带有十几个按钮的工具栏。
By default there is a single row with about a dozen buttons.
默认情况下书签工具栏已被替换成一个书签按钮(可以切换回来)。
The Bookmarks Toolbar has been replaced with a Bookmarks Button by default (you can switch it back if you'd like).
例如，我们不想要我们的按钮拥有一个默认的长方形的按钮的外观，而是要它们有一个象下面这样的自定义的圆形按钮外观。
For example, let's say we don't want our buttons to have the default rectangle push button look, and instead we want them to have a custom round button look like below.
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