现代的Web设计开始越来越多地使用浮动属性来获得之前使用表实现的页面布局。
Modern Web design is using the float property more and more to obtain page layouts previously done using tables.
当您设计 portlet 时，应尝试使您的表的布局简单些，以便屏幕阅读器可以按照逻辑顺序读取 portlet。
When you are designing your portlet, try to keep your table layouts simple so that the screen reader will read the portlet in a logical order.
设计新数据库的物理布局应当从设计表空间的组织开始，步骤如下。
Start designing the physical layout of a new database by designing the table space organization, as shown in the following steps.
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