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1. Oxford Dictionary

   pacemaker

   • IPA[ˈpeɪsˌmeɪkə]

   英式

   • n.
     a person or animal who sets the pace at the beginning of a race, sometimes in order to help a runner break a record；a person who sets standards of achievement for others

   • noun: pacemaker, plural noun: pacemakers

2. • 釋義

   n.

   名詞

   • 1. a person or animal who sets the pace at the beginning of a race, sometimes in order to help a runner break a record he acted as a pacemaker for Bannister when he broke the four-minute mile
   • ▪ a person who sets standards of achievement for others unbeaten Rangers are the surprise pacemakers
   • 2. a device for stimulating the heart muscle and regulating its contractions.
   • ▪ the part of the heart muscle (the sino-atrial node) which normally regulates contractions.
   • ▪ the part of an organ or of the body which controls rhythmic physiological activity the brain's circadian pacemaker which regulates our ‘biological clock’
3. • 更多解釋

   pacemaker

   • IPA[ˈpāsˌmākər]

   美式

   • n.
     an artificial device for stimulating the heart muscle and regulating its contractions.

   Oxford American Dictionary