Fournon福尔农fournum.四four thousand four hundred and three(=4403) 四千四百零三four thousand six hundred and eighty(=4680) 四千六百八十four-wire line termination circuit四线终端电路four thousand five hundred and seven(=4507) 四千五百零七Fourier transform Raman spectroscopy傅立叶变换拉曼光谱Four pillars plate hydraulic machine四柱平板液压机four-connecting rod eccentric gear四连杆偏心轮机构four thousand nine hundred and sixty(=4960) 四千九百六十four thousand nine hundred and three(=4903) 四千九百零三four-dimensional data assimilation四维资料同化