系统调用是请求内核中服务的一种有效方法。
System calls are an efficient way of requesting services in the kernel.
服务请求提供了不同系统工件联系的评价方法。
Services Requested provide a measure of the interconnection of different system components.
但是，在某些情况下(例如，服务所请求的后端系统或数据库不可用)，该服务可能会以错误消息作为响应。
However, in certain circumstances, for example, when either a back-end system or a database that a service requires is not available, the service might respond with a fault message.
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