to expand and contract in a rhythmic mannerblood vessels pulsing in time with the heartbeat
blood vessels pulsing in time with the heartbeat
beat, palpitated, pit-a-patted, pitter-pattered, pulsated, throbbed
fluctuated, oscillated, vibratedquivered, trembled
英语同义词词典收录了63618条英语词条，基本涵盖了全部常用同义词或反义词的辨析及翻译，是英语学习的有利工具。