关键主机隐藏  critical host hiding

主机主键  host master key

关键机件  key element

关键零件  key parts

电子邮件主机  email hosting

多宿主主机  multi-host mainframe

飞机主机械操纵系统  main mechanical manipulating system of aeroplane

集装箱装卸机主机架  container handler main frame

零件主文件  part family

双网关主机  dual-gateway server

压缩机主机头  compressor

由外来主机关闭的连接  Connection closed by foreign host

主关键层  primary key stratum; primary key stratum PSK; main key stratum

主关键词  major key

主关键码  primary key

主关键字  primary key

主零件  master part

主零件目录  aerofoil E168

保全关键机制  security critical mechanisms

柴油发动机零件  diesel engine component