使用鼠标使指针在图片按钮上进行移动。
Use your mouse to move the pointer over these graphic buttons.
可以优化的重要页面元素包括标题、图形、图片、命令按钮、结构和布局。
Important page elements that can be optimized include headlines, graphics, images, command buttons, structure and layout.
很多设计师都知道空白的价值，也就是页面中段落、图片、按钮和其它元素之间的空白。
Most designers know the value of white space, which is the empty space between paragraphs, pictures, buttons and other items on the page.
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