这使呈现没有被HTML元素包装的多行内容块变得方便。
This makes it convenient when you want to render multi-line content blocks that are not wrapped by an HTML element.
row_label助手将获取一个块并将块文本(而非其他行内容)放入标签标记中。
The row_label helper takes a block and places the block text in the label tag, with no other row contents.
样式表提供了，包括指定一个元素是作为块级别还是行内来展现在内的，控制元素绘制的方法。
Style sheets provide the means to specify the rendering of arbitrary elements, including whether an element is rendered as block or inline.
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