Defibrillators are devices that use electricity to shock the heart.

波士顿马拉松以及其它大型赛事都沿赛道安放了除颤器。除颤器是利用电力来震动心脏的装置。

Backus said the defibrillator had to save him by shocking his heart back into normal beating.

巴克斯说，除颤器必须通过电击他的心脏恢复正常跳动来拯救他。

If he starts to flatline, a nurse can use a defibrillator to shock his heart back into action.

如果他的心脏停跳了，护士可以用除颤器让他的心脏恢复跳动。

Two more ran to get the school nurse, who brought a defibrillator, an electronic device that can shock the heart back into work.

还有两名学生跑去找学校的护士，护士带来了一台除颤器，这是一种可以使心脏恢复运作的电子设备。