试着保留应用程序之间的交互作用点。
每一个服务交互作用点都涉及到一个简单协议，该协议影响被提供的和被要求的接口。
Each of these service interaction points is involved in a simple protocol that affects provided and required interfaces.
例如，货品计价交互作用点要求Invoicing接口启动价格计算器，并且发送运送价格。
For example, the invoicing interaction point requires the invoicing interface to initiate price calculations and send the shipping price.
SCA不能够同时支持用于同一个交互作用点的被提供和被需求的接口，因此为提供和需求接口的服务端口分别创建导入和导出元素。
SCA cannot support both provided and required interfaces for the same interaction point, thus separate import and export elements are created for service ports that provide and require interfaces.
SCA不能够同时支持用于同一个交互作用点的被提供和被需求的接口，因此为提供和需求接口的服务端口分别创建导入和导出元素。
SCA cannot support both provided and required interfaces for the same interaction point, thus separate import and export elements are created for service ports that provide and require interfaces.
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