AIM: Achalasia is the best known primary motor disorder of the esophagus in which the lower esophageal sphincter (LES) h......

纹影法是一种将相分布转换为可见图像的光学方法,它可以用于测量一个区域内的空气折射率。彩虹纹影法则是将传统的刀口换为彩虹滤......