Through a complex process whereby the NH4+ reenters the tubular cells in the loop of Henle, a countercurrent gradient of ammonia (NH3) is created in the medulla of the kidney.是什么意思_Through a complex process whereby the NH4+ reenters the tubular cells in the loop of Henle, a countercurrent gradient of ammonia (NH3) is created in the medulla of the kidney.在線翻譯_英語_讀音_用法_例句