sca模块包含一系列组件、外部服务、入口点，以及用于衔接这些部分的机制。
A SCA module contains a set of components, external services, entry points, and the wires that interconnect them.
该图表明，导出是外部的入口点，而导入则允许您调用模块外的功能。
The figure shows how exports are an entry point from the outside world, while imports enable you to call outside the module.
入口点用于声明可外部访问的子系统服务。
Entry points are used to declare the externally accessible services of a subsystem.
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