Doctor Michael Sayre works at Ohio State University.
医生迈克尔塞尔在俄亥俄州立大学。
Doctor Sayre says you do not need a measuring stick or a timing device.
塞尔医生说你不需要一个标尺或定时装置。
Doctor Sayre suggests that medical workers do both the breathing method and chest compressions.
塞尔医生建议，医务工作者做呼吸法和胸外按压。
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