( Normally ( , ( ( both ( ( ( your stomach ) and ) duodenum ) ) ( ( are ( ( bathed constantly ) ( in ( gastric acid ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Normally)) (, ,) (NP (CC both) (NP (PRP$ your) (NN stomach)) (CC and) (NP (NN duodenum))) (VP (VBP are) (VP (VBN bathed) (ADVP (RB constantly)) (PP (IN in) (NP (JJ gastric) (NN acid))))) (. .)))
Normally, both your stomach and duodenum are bathed constantly in gastric acid.
(ROOT (S (NP (JJ Gastric) (NN emptying)) (VP (VBZ is) (VP (VBN regulated) (PP (IN by) (NP (NP (PDT both) (DT the) (NN stomach)) (CC and) (NP (DT the) (NN duodenum)))))) (. .)))