Using complexity metrics for class length, method length, and intra-class coupling (that is, object imports and unique types) is the first step toward understanding what you're up against.
You cannot use any other implementation so you end upcoupling your code to it.
您不能使用任何其它实现,因此您最终将代码与该实现耦合。
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However, when you end up refactoring a large code base, coupling pops up everywhere because that's one of the reuse mechanisms in object-oriented languages.