The service layer is responsible for specifying the operation used in that service and the content of the message used by these operations.
服务层负责指定在该服务中使用的操作以及这些操作所使用的消息的内容。
I am making the assumption here that the read operation (as an entry point to the API layer) is not in turn invoking write operations on the database.
我在此处假设读操作(作为api层的入口点)不会对数据库调用写操作。
Intensive processing was required to parse data in the Presentation Services layer and extract the sub-set of data needed for a specific operation.
需要大量处理工作来解析presentation services层的数据，以及提取特定操作所需的数据子集。
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