?主要成分

... 主要成分primary component 次要成分secondary component 纤维素cellulose ...

?主构件

... 知构件 primary member 主构件 main member; main piece; primary component; primary member 纵构件 longitudinal member ...

[天]?主星

... primary clock 母钟 primary component 主星 primary maximum 主极大 ...

?主组件

主组件(Primary Component) 除了单节点故障,由于网络故障集群可以分割成几个组件。