对于清单5中的每个结构，相应地会创建一个新表“S_ORDER”(参见清单8)。

Per the structure in Listing 5, a new table "S_ORDER" (see Listing 8) is created accordingly.

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缺点是每次在类层次结构的任何地方添加一个新属性时都必须将一个新属性添加到表中。

The disadvantages are that every time a new attribute is added anywhere in the class hierarchy a new attribute must be added to the table.

youdao

该选项仍然需要一些规划，特别是在什么地方使用新的 2.0 特性，并调查在新的样式表结构中旧模块的可重用性。

This option still requires some planning, particularly about the places where you will use new 2.0 features, and investigating the reusability of old modules in your new stylesheet structures.

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