结肠镜检查是一个艰难的过程掌握，肠胃需要监督程序百年才达到专家的水平。
Colonoscopy is a difficult procedure to master, and gastroenterologists require hundreds of supervised procedures to reach an expert level.
结肠镜检查是一个艰难的过程掌握，肠胃需要监督程序百年才达到专家的水平。
Colonoscopy is a difficult procedure to master, and gastroenterologists require hundreds of supervised procedures to reach an expert level.
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