封头

1.shellcover  2.endplate  3.rotaryheader  4.endsocket  

封的英语翻译：

envelop; seal
【经】 seals

头的英语翻译：

beginning or end; cobbra; conk; crumpet; end; first; garret; hair; head
leading; nob; noddle; pate; sconce; side; top; twopenny
【医】 capita; caput; cephal-; cephalo-; head; kephal-; kephalo-