Occasional arrhythmias are normal. Tachycardia is a fast regular rhythm; Bradycardia is a slow rhythm.是什么意思_Occasional arrhythmias are normal. Tachycardia is a fast regular rhythm; Bradycardia is a slow rhythm.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句