材料证书—如果用户要求，可以提供主要阀门部件完整的化学和物理特性资料。
Material certification-when specified, complete chemical and physical properties of major valve components can be supplied.
工具包提供的功能比部件库更多，通常可以提供完整的应用程序开发框架。
Toolkits provide more functionality than widget libraries, and often offer complete application developer frameworks.
如果要使一种设计运转良好，这个设计的零部件就必须完整可靠。
In order for a design to work well we have to have every component there.
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