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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 ]
仰卧起坐
背朝下平躺，膝部弯曲，双脚着地。双手交叉置于胸前。收缩腹部肌肉，缓慢地将肩膀抬离地面 10 英寸，同时保持头部向后（下巴不应该接触胸部）。然后放松腹部肌肉，缓慢地放下肩膀。做 3 组，每组 10 个。
