Use case descriptions: Textual descriptions of the major services provided by the system under discussion.
用例描述：用文字描述系统提供的主要功能。
Lossless data compression is one of the major services in space flight missions and remote-sensing systems.
无损数据压缩是航天应用和遥感系统的重要业务之一。
The services were limited to plumbing and electrical with no major services like vertical transportation (lift) or air conditioning.
该服务仅限于水暖和电器，没有重大的服务，如垂直运输(电梯)或空调。
At present, the major services include special websites for consultation, asynchronous consultation, real-time interactive service and network cooperative consultation.
目前网络信息咨询服务主要有：专门的咨询网站、异步咨询服务、实时交互服务和网络合作咨询等途径。
At present, the major services include special websites for consultation, asynchronous consultation, real-time interactive service and network cooperative consultation.
目前网络信息咨询服务主要有：专门的咨询网站、异步咨询服务、实时交互服务和网络合作咨询等途径。
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