halfwitn.笨蛋halfn.一半；下半场；半学年adj.一半的；不完全的adv.一半地；不完全地half-duplex connection半双工连接half duplex transmission半双工传输halfduplex communication半双向通道通信half-wave transmission半波传输Half the car was damaged车子毁了一半。half side milling cutter半边靠模铣刀,半侧铣刀,双面刃铣刀half-pipe snowboarding单板U型场地滑雪half-turn coil winding半匝绕组half-tone storage tube半色调存储管Half of them are gone.他们之中的一半人走了。