extrasystolic期: designated time外: outside; external side收缩: contract; shrink的: 4次方是 The fourth power of 2 i ...额期外收缩: extrasystole; premature beat下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:期外收缩的，即可在微信中查询翻译
