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.
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。
It looks at stylesheets from a software engineering point of view and shows how to make them more robust and secure.
它将从软件工程的角度观察样式表，并展示如何使之更加健壮和安全。
Because oil is likely to become more costly in the future, natural rubber looks an attractive alternative from an economic point of view as well as an engineering one.
石油在未来可能更加昂贵，所以，从经济及工程角度来看，天然橡胶似乎是不错的选择。
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