Think of efferent coupling as the inverse of afferent coupling.
可以把传出耦合看作传入耦合的逆转。
Notice the Ca (afferent coupling) metric for this class, which has a value of 3.
注意这个类的Ca(传入耦合)指标，它的值为3。
As with afferent coupling, the abstractness metric comes into play in efferent coupling.
与传入耦合一样，抽象性度量在传出耦合中起作用。
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