主要从业务和工程角度来看，PLM必须在产品的开发和有效生命期内管理其描述和属性。

PLM has to do with managing descriptions and properties of a product through its development and useful life, mainly from a business and engineering point of view.

youdao

一款设计成只能维持其有效生命周期的绿色手机，两年的有效期到了，它就会散开，以便于回收。

Green mobile phones designed to last only for the length of its functional life cycle, they fall apart for easy recycling after two years are up. [link].

youdao

系统语义的正式文档(通过建模)将提高软件质量，延长设计的有效生命周期(从而提高roi)。

Formal documentation of system semantics (through modeling) will increase software quality and extend the useful lifetime of designs (thereby increasing ROI).

youdao

There are children who by a relatively modest donation to an effective aid agency, you could save their lives.

要拯救这些儿童的生命,只需要你向比较有效的救助机构,捐赠适量的钱款。

普林斯顿公开课 - 人性课程节选