The precise form of the pattern is certain to be somewhat different for each instance, and the objects that define it will naturally vary from domain to domain, but the relationships between objects remain essentially the same.

• 模式的精确形式在每一个设计方案中都会有或多或少的差别，定义模式的对象自然因产品领域而各不相同，但对象之间的关系基本保持一致。