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。

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。

These problems are made in a sealed diving sewage pump, electrical load-bearing capacity, bearing arrangement and requirements for the use of the sewage pump than the average higher.

这些问题都使得潜水排污泵在密封、电机承载能力、轴承布置及选用等方面的要求比一般的污水泵要高。