pacemaker
noun [ C ] uk/ˈpeɪsˌmeɪ.kər/ us/ˈpeɪsˌmeɪ.kɚ/
(RUNNER)
(also pacesetter, uk/-ˌset.ər/ us/-ˌset̬.ɚ/)领跑人，领跑动物;带头人，标兵
the person or animal that establishes the speed in a race, or a person or organization that is an example for others by being successful
(DEVICE)
心脏起搏器
a small device that is put inside someone's chest in order to help the heart beat at the correct speed