The end result of any systems development methodology is a product, 1 usually composed of many atomic sub-elements (components) that can be identified by part number and field-replaced as a unit.
任何系统开发方法的最终结果都是一个产品，1通常被由许多原子级子元素（组件）组成，可以被部件号码和替换字段标识为一个单元。
This is the first unit in support of the new MPACT Pure Air Compression Technology systems development program.
这是第一个支持新式MPACT纯空气压缩技术系统开发计划的单元。
Unit testing and test-driven development are excellent tools for managing such fragile systems with confidence, but they only work if you use them.
单元测试和测试驱动的开发这些出色的工具使您可以信心十足地管理此类脆弱系统 ——但只有在您确实使用了这些工具时，它们才能发挥作用。
Unit testing and test-driven development are excellent tools for managing such fragile systems with confidence, but they only work if you use them.
单元测试和测试驱动的开发这些出色的工具使您可以信心十足地管理此类脆弱系统 ——但只有在您确实使用了这些工具时，它们才能发挥作用。
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