一、原材料引用（Materials） However,a new Japanese study questions the usefulness...

原材料引用（Materials） 原文 CPR keeps blood and oxygen flowing to the heart and ...

原材料引用(Materials) The heart stops pumping blood. The person stops breathi...

一、原材料引用: The condition is called cardiac arrest. ðə kənˈdɪʃən ɪz kɔːld ˈ...

1.Materials This is the VOA special English Health report. 2.Facts ðɪs ɪ...

1.Materials This is the VOA special English Health report. 2.Facts ðɪs ɪ...