Do this by pushing up and down on the centre of the chest, with your hands interlocked together, constantly until an ambulance arrives.

　　把你的手交叉相扣，按住胸腔中心部分上上下下的不停的按，直到救护车到达。

　　Push at a rate of 100 beats a minute。You can't harm them doing this and might just save a life.

　　保持一分钟一百次的频率。你这样坐不会伤害到他们，但却能挽救一条生命。

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