pulsating

1. V-I If something pulsates, it beats, moves in and out, or shakes with strong, regular movements. 有節(jié)奏地跳動(dòng)

The Pole Star appears to be changing from a star that pulsates. 北極星似乎由一顆脈動(dòng)的恒星衍變而來(lái)。