Afieldtripisajourneybyagroupofpeopletoaplaceawayfrom61(...
問題詳情：Afieldtripisajourneybyagroupofpeopletoaplaceawayfrom61(they)normalenvironment.Thepurposeofthetripisusuallyobservationfor62(educate),non-experimentalresearchortoprovidestudentswithexperiencesou...