Fourot富罗fournum.四four cutter bit四牙轮钻头four-bed room四居室fours on farmer农民本位four fold table四重表four fold block四饼滑车four contactors四级接触器four way wrench四用扳手four-corneredadj.有四个角落的；四方的；方形的adj.有四人参加的Four principles“四性”原则four capaeities四种能力