文字总是发不出来说需要审核，只好放在附件截图里了
强侧换气练习片段：
http://v.youku.com/v_show/id_XNTgxMTY2OTUzMg==.html?x&sharefrom=iphone&sharekey=72afded3b339accb2470bff64bd617102
练习双侧换气的片段：
http://v.youku.com/v_show/id_XNTgxMTc5NDcxNg==.html?x&sharefrom=iphone&sharekey=cfaf0514287cd4cadfe2a60ed37aeb2a2
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