3.3耦合（或者依赖）关系的种类： 零耦合（Nil Coupling）关系：两个类没有耦合关系 具体耦合（Concrete Coupling）关系：发生在两个具体的（可实例化的）类之间，经由一个类对另一个具体类的直接引用造成。
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因而，在具体项目中还是应该由系统架构师来决定在哪儿、以哪种方式应用松耦合。
Therefore, there still has to be a system architect who decides where and in which form loose coupling is appropriate in a concrete project.
SCA代表了一些人们常常统称为“SOA”的具体步骤：重用、组合、策略管理和松耦合服务。
SCA represents some very concrete steps for what people often vaguely describe as "SOA" : reuse, composition, policy administration, and loosely coupled services.
具体就是运用了一个叫做谐振耦合的现象。在此现象中，以相同频率随着电子频率一起振动的金属线圈能够高效的传输能量。
Specifically, it exploits a phenomenon called resonant coupling, in which metal coils that resonate at the same electrical frequency can exchange energy particularly efficiently.
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