这样确保了这个容器确确实实的充当了容器的作用，以包容它内部浮动的列表项。

This helps ensure the container actually “contains” the list items inside which will also be floated.

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索尼爱立信的Rachel用户界面仅仅是把列表变成一个个半透明的浮动部件。

Sony Ericsson's Rachel UI does little more than organize lists as floating pieces of translucent paper.

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一个菜单显示为一个浮动菜单项列表(类似于一个对话框)，在用户执行一个长点击(按下并保持住)在一个视图，宣布支持一个上下文菜单。

A menu appears as a floating list of menu items (similar to a dialog) when the user performs a long-click (press and hold) on a view that declares support for a context menu.

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