Principles of key关键性原则principlesn.原则；原理；道义；节操名词principle的复数形式.Principles of double crank mechanism双曲柄机构原理Principles of reliable data transfer可靠数据传输原理Principles and Operating of Computer计算机原理与操作Principles of Land Resources Planning国土规划原理Principles and applications of electr电气工程原理与应用principles of honesty and credibility诚实信用原则Principles of Radiative Heat TransferPrinciples of Visual Interface Design交互界面设计的原则Principles of Moderns Optical Systems现代光学系统原理Principles of Computer Composition gq计算机组成原理