Dictionary.com: (World heritage) Archive-It的存檔,存档日期2008-04-07 "3. any device that converts another form of energy into mechanical energy to produce motion"
Interconnections and Encapsulation, AD 654-630, vol.14 of "Integrated Silicon Device Technology" ASD-IRD-63-316, Research Triangle Institute, 1967, May 魏雄。《PowerPCB