A cardiac arrest is a disruption of the electrical signals that trigger heartbeats, causing the heart to beat erratically so that it does not pump blood effectively.

心脏骤停是一种对触发心跳的电信号的破坏，能够导致心脏不稳定地跳动，使其不能有效地供给血液。

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The multi-step approach makes this artificial heart much cheaper to build than those that use compressed air to pump the blood.

与使用电池动力压缩空气将血液输送到全身的装置相比，新型人造心脏的造价更加低廉。

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An electrical wave traverses the heart each time it beats, co-ordinating the contraction and relaxation of the chambers that pump blood around the body.

随着心室的收缩和舒张将血汞到了全身，心脏跳动一次，电波横穿心脏一次。

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