pulsation       
noun [ C or U ] uk/pʌlˈseɪ.ʃən/ us/pʌlˈseɪ.ʃən/
 (强劲、有节奏的)跳动,震动
the action of moving with a strong, regular rhythm
  The star's pulsations cause it to brighten and dim every six minutes. 这颗恒星的脉动使它每六分钟变亮变暗一次。 
 Every blink of an eye or pulsation of a paramecium is powered by the protein ATP. 草履虫的每一次眨眼或脉动所需的能量都是由ATP(三磷酸腺苷)蛋白质提供的。 
 See: pulsate
 - More examples
 - The pulsation of Glass' music occasionally drives the dance in discernible ways.
 - A digital to analogue converter turns digital pulsations into an analogue signal.
 - Time-signatures seldom express the pulsations of his music.