把电极通入一个或多个心房或心室，并使导入一条大静脉，就可以通过有规律的小幅电击模拟窦房结发挥作用。
By inserting electrodes into one or more of the Chambers of the heart, via a large vein, it is possible to mimic its function by applying small electrical shocks at regular intervals.
如果在静脉里注射肉豆蔻是有剧毒的。
如果你有静脉曲张的家庭病史或开始超重的话你就更可能会出现这种症状。
You’re more likely to develop them if you have a family history or are overweight to begin with.
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