pepsin

The impressively named chief cells secrete pepsinogen which, when it mixes with stomach acid, becomes an enzyme called pepsin.

而令人印象深刻的主细胞则分泌胃蛋白酶原，当它与胃酸混合时，就形成一种酶，叫做胃蛋白酶。

But while stomach acid is a factor, Dr. Koufman says, the real culprit for many patients is pepsin, a digestive enzyme that can exist in the esophagus.

但考夫曼博士指出，胃酸只是其中的一个因素，胃蛋白酶才是很多患者的症结所在，这是可以存在于食道的一种消化酶。

Koufman says, the real culprit for many patients is pepsin, a digestive enzyme that can exist in the esophagus.

胃蛋白酶是能存在于食道的一种消化酶。