Fourez富雷fournum.四four-bar linkage structure四连杆机构four thousand and sixty five(=4065) 四千零六十五four variety fruit preserves四色蜜饯four thousand and twenty one(=4021) 四千零二十一Fournier gangrene of scrotum特发性阴囊坏疽four-mode laser gyroscopes四频激光陀螺four hundred and sixty seven(=467) 四百六十七four channel multiband camera四通道多光谱带照相机four championships on the run四连冠Fourier spectrum energy ratio傅里叶频谱能量比