Fourot富罗
fournum.四
four-seventhsnum.七分之四
four party line[电] 四户合用线
four-bar knee四杆式假膝
four requisites四要件
four-DOF load四自由度载荷
four-electronn.四电子
four-pin plug四脚插头,四柱插销
four-stranded四股绳
Four X syndrome四X综合征
four-way stop四向停车