是友好和有用的 be friendly and helpful
和有用背景资料 And Useful Background Information
启动专有协议和应用 Enabling Specific Protocols and Applications
有用的和可靠的 Be Useful and Reliable
有用字和词句 Useful Words and Expressions
和其他有用信息 And Other Useful Information
所有使用和阅读 all use and read
和有效用户反应 Efficient Consumer Response ; ECR
和感知有用性 Perceived Usefulness
财产的所有权和使用权 right of property
因此，它包括大量复杂(和有用)的代码。
As a result, it includes a large amount of complex (and useful) code.
它显示持续更新的进程列表和有用的摘要信息。
It displays a continuously updated process list, along with useful summary information.
越来越多的人才回国，带回知识和有用的社会关系。
An increasing number go home, taking with them both knowledge and contacts.
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