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。
Hydrogen: Lightest chemical element, chemical symbol h, atomic number 1.
氢：一种轻的化学元素，化学符号H，原子序数1。
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