heart-beat
  心搏
  heartbeat
       n 1: the rhythmic contraction and expansion of the arteries with
            each beat of the heart; "he could feel the beat of her
            heart" [syn: pulse, pulsation, beat]
       2: a very short time (as the time it takes the eye blink or the
          heart to beat); "if I had the chance I'd do it in a flash"
          [syn: blink of an eye, flash, instant, jiffy, split
          second, trice, twinkling, wink, New York minute]
       3: an animating or vital unifying force; "New York is the
          commercial heartbeat of America"