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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 ]
彩色多普勒超声心动图提供心脏动态的二维图像。左上角附近，可以看到心脏跳动和心脏瓣膜的启合。用彩色多普勒表示通过心房和心室的血流速度与方向。
视频由哥伦比亚大学内科和外科医师学院生物医学交流中心提供。
