unexplained gastrointestinal bleeding
noun [ U ] medical specialized uk/ʌn.ɪkˌspleɪnd ɡæs.trəʊ.ɪnˌtes.tɪn.əl ˈbliː.dɪŋ/ us/ʌn.ɪkˌspleɪnd ɡæs.troʊ.ɪnˌtes.t̬ən.əl ˈbliː.dɪŋ/
不明原因的消化道出血
bleeding from the digestive system for which the cause is not known