The hydrochloric acid present in the stomach aids digestion by breaking down large and complex food molecules.
ðə hˌaɪdɹəklˈoːɹɪk ˈæsɪd pɹˈɛzənt ɪnðə stˈʌmək ˈeɪdz daɪdʒˈɛstʃən baɪ bɹˈeɪkɪŋ dˌaʊn lˈɑːɹdʒ ænd kˈɑːmplɛks fˈuːd mˈɑːlɪkjˌuːlz.