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• Use “ “ for phrases o [ “pediatric abdominal pain” ] • Use – to remove results with certain terms o [ “abdominal pain” –pediatric ] • Use OR to account for alternate terms o [teenager OR adolescent ]
当膈肌收缩时，胸腔增大，胸内压力降低。为维持压力平衡，空气进入肺内。当膈肌松弛时，肺和胸壁的弹性将气体排出肺。
