This product type hierarchy is defined in a metadata structure and has an associated set of database tables and business services.
这种产品类型层次结构使用元数据结构进行定义，并具有一组相关数据库表和业务服务。
As you can see with the examples above, the structure type of the product is used with the relationships structure when the structure type implies that other products are involved for a given product.
从上面的例子可以看到，如果结构类型表示给定产品中涉及了其他产品，那么产品的结构类型将同关系结构一起使用。
The experiment showed that the damage of electronic product in vibration environment has relation with type and amplitude of vibration and structure of the product.
试验表明：电子产品在振动环境中的损伤不仅与振动类型及幅值有关，也与其自身结构有着密切的关系。
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