An endoscopy and biopsy can be done to diagnose Barrett's esophagus.

内镜和活检可以诊断Barrett食管。

This causes the epithelium of the lower esophagus to constantly renew, and when it's replaced by columnar epithelium, that's called Barrett's esophagus.

这使得食管下段的上皮不断更新，当其被柱状上皮取代时，叫做Barrett食管。

Also, an endoscopy - which is when a tube with a camera at the end is placed into the esophagus - and a biopsy, are essential to diagnose Barrett's esophagus and to evaluate the risk of cancer.

此外，内镜检查（也就是将末端带摄像头的管子放入食管内）以及活检，均对诊断Barrett食管和评估患癌风险是必不可少的。