This creates a very flexible environment that you can use, for example, to replace an approval module that contains a human task with a module containing a business rule.

这就创建了一个非常灵活的环境，例如，可以通过这一环境，使用包含业务规则的模块替换包含人工任务的审批模块。

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For example, you can use an approval module that contains a human task for the actual approval and later later replace it with another approval module containing a business rule.

例如，您可以使用包含用于实际审批的人工任务的审批模块，随后使用包含业务规则的另一个审批模块替换它。

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Replaceability: Having defined a contract or interface, you need to be able to replace the module without breaking the system.

可替换性：定义了合约或接口后，您需要能够替换模块而不影响系统。

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