RUP acknowledges four levels of testing: unit testing, integration testing, system testing, and acceptance testing.
RUP确定了四级测试：单元测试、集成测试、系统测试和验收测试。
Secondary service models are in progress, and many have standardized billing and metering models that have gained acceptance in all levels of business.
还有一些辅助服务模式正在开发过程中，其中许多已将计费和计量模式标准化，现在已受到企业各层的认可。
Like to Greek literature, Zhou Zuoren's acceptance to Greek culture, is also beginning from two levels, namely, personal interest and society demands.
与希腊文学一样，周作人对希腊文化的接受，也是从社会需要与个人趣味两个层面展开。
Like to Greek literature, Zhou Zuoren's acceptance to Greek culture, is also beginning from two levels, namely, personal interest and society demands.
与希腊文学一样，周作人对希腊文化的接受，也是从社会需要与个人趣味两个层面展开。
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