He is said the heart Association should remove rescue breaths from the guidelines he argues that morewitnesses to cardiac arrest would provide treatment if rescue breaths are not a part of CPR.
语音语调还需要模仿调整，还是要多听多练
听了别人的发音，知道了各种各样的问题，特别可以帮助自己找到问题，也可以习耳朵，有时候想外国人也应该有各种各样的语音吧
累积练习半小时
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