cardiac activity的用法和樣例：
例句
- Cardiac arrest kills more than three hundred thousand people in the United States every year.
在美國，每一年有超過三十萬人由於心搏停止而喪失性命。 - Sustained chronic tachyarrhythmias often lead to cardiac dysfunction known as tachycardia-induced cardiomyopathy or tachycardiomyopathy.
摘要持續性的心搏過速會造成心臟功能變差，稱之為心搏過速引發之心肌症。
