Fouret富雷fournum.四four-six Bi-antithesising四六化four-member-ring compound四员环类化合物four hundred and ninety eight(=498) 四百九十八four-high roller level-er四重式多辊矫直机four thousand and eighty four(=4084) 四千零八十四Four cubed is sixty-four.四的立方是六十四。four-bar linkage mechanisms铰链四连杆机构four thousand and one hundred(=4100) 四千一百four thousand and eighty five(=4085) 四千零八十五Fourier pseudospectral method傅立叶伪谱法