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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。
British firm, Aggreko, has won a contract to set up electrical generators to supply 30mw to Ethiopia's grid.
英国公司Aggreko赢得了一份建造为埃塞俄比亚提供30 MW电力的发电机的合同。
When your heart beats, the electrical impulses that cause it to contract follow a precise pathway through your heart.
心脏右上角的窦房结会规律性地发出电脉冲，电脉冲通过一系列错综复杂的通路传导至心脏各处，由此产生规律性的收缩。
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