可以为诸如维护活动等事情创建附加的开发线。

Additional development lines can be created for things like maintenance activities.

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产品线的开发组织可以开发和维护一条软件或者系统产品线，而不是单一产品。

Product line development. An organization may develop and maintain a line of software or system products, rather than a single one.

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对更复杂的事物，试想同样的产品线有一个以前的版本，1.0版本——同样继续交付维护版本（版本1.1,1.2,1.3等等）。

To further complicate matters, imagine that this same product line had a previous release, Version 1.0, which is also continuously delivering maintenance releases (Versions 1.1, 1.2, 1.3, etc.).

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