Afieldtripisajourneybyagroupofpeopletoaplaceawayfrom61(...
问题详情：Afieldtripisajourneybyagroupofpeopletoaplaceawayfrom61(they)normalenvironment.Thepurposeofthetripisusuallyobservationfor62(educate),non-experimentalresearchortoprovidestudentswithexperiencesou...