词汇	ringback music
释义	ringback music n.彩铃
随便看	four-ferminal probe techniques four-fermion interaction four-field box technique Four Fields four-fifteen four-fifth four-fifth crown four fifths four-fifths Four-fifths choose an HMO four-frequency system Four from nine leaves five four-frquency differential laser gyro four F's four 'F's infection four-figure four-figure code four-figure display four figures four-figures four figure system four-figure system four-figure table Fourfile Germander Herb Four fine stone steps lead up to the front door