单词	假牙颈--颈圈
释义	颈圈，假牙颈collar
随便看	selector--directional control valve selector disc selector frame selector head selectorial selector input/output processor selector input/output processor--siop selector input/output processor，siop selector key selector light pen selector magnet selector, mechanical neutron velocity selector-- mechanical neutron velocity selector mode selector, neutron velocity selector pen selector pen attention selector plus routine selector, pulse-height selector range selector register selector relay selector repeater selector rod selectors