Having several environments reduces competition among the environments, so that, for example, user acceptance testing does not interfere with performance testing.

拥有几个环境可以减少环境之间的竞争，这样用户接受度测试就不会影响性能测试。

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Selenium is one of the first of a new breed of open source, browser-driving Web testing frameworks that automate user acceptance testing — and as such, it is outstanding.

Selenium是驱动浏览器的开源web测试框架中新出现的工具之一，它能够使用户验收测试自动化——因此，它非常优秀。

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You need to track the release as it moves through each environment: development, integration, operational acceptance testing, user acceptance testing, staging, and production.

您需要跟踪发布版本在以下每个环境中的情况：开发、集成、操作接受度测试、用户接受度测试、过渡和生产环境。

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