尽管十二指肠胃食管反流的研究已有100多年历史，但不明点仍很多。
There are also many unanswered questions on the duodenogastroesophageal reflux(DGER), though it has been studied for more than 100 years.
尽管十二指肠胃食管反流的研究已有100多年历史，但不明点仍很多。
There are also many unanswered questions on the duodenogastroesophageal reflux(DGER), though it has been studied for more than 100 years.
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