Pacemaker
01
心脏起搏器, 心律调节器
an electronic device implanted inside a person's body to help regulate their heart rate
02
领跑者, 定速马
a horse used to set the pace in racing
03
起搏器, 心脏起搏器
a specialized bit of heart tissue that controls the heartbeat
04
先驱, 领导者
a leading instance in its field
