halfer单脚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 word input半字输入half tide level半潮水位,平均潮面half round edge圆弧棱边half screw stake半螺丝桩halftime emitter中间发射器half-way point中间点Half-ring gear半齿圈half-tone font半色调字体half wave length半波长half meal ticket半价餐票