Normally the sinoatrial node generates regular electrical pulses that spread across the Chambers of the heart, causing the cells to contract in synchrony.

正常情况下，窦房结产生规律的电脉冲，传入各心房，再带动细胞同步收缩。

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At the heart of the fire, temperatures easily exceeded 1,000 degrees [Fahrenheit]. Lethal clouds of carbon monoxide and other gases swirled through the rock Chambers.

在大火中心，温度超过1000度，由一氧化碳和其它毒气形成的致命云团裹住了人们的房子。

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When the heart beats, an electrical signal passes from the top of the heart, near the atria (upper chambers), down through the ventricles (lower chambers), and the chambers contract in that order.

当心脏跳动时，一个电子信号就会从心脏的顶部传到一个心腔（位于上部），然后是位于下部的心腔，当它收缩时，也是按照这样的顺序。

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The upper chambers of the heart quiver or beat too fast or too slow.

NPR: Heart Repair Breakthroughs Replace Surgeon's Knife

This is a potentially deadly condition in which the individual chambers of a heart beat out of phase with each other.

ECONOMIST: Model behaviour

Lotem said that during the heart catheterization procedure doctors would use a thin plastic tube to insert an "umbrella-like" device that will seal the hole between the two upper chambers of the heart.

CNN: Sharon heart operation set for Thursday