. physical a.物理,实际 physical address物理地址 physical layer物理层 比较 logical a.逻辑 5. design v.设计 design cycle设计周期 All the phases involved in developing and producing new hardware or software 设计或开发新硬件或软件所涉及的所有阶段。5 4. physical a. 物理，实际 physical address 物理地址 physical layer 物理层 比较 logical a. 逻辑 5. design v. 设计 design cycle 设计周期 All the phases involved in developing and producing new hardware or software. 设计或开发新硬件或软件所涉及的所有阶段