4.Material for Building

Shelterfromthenaturalelementsisabasicneed.Earlypeoplemetthisneedbydwellingincavesandthentheirdescendantsbegantoconstructbuildings.Keyfactorsinthedesignofthesesheltersweretheclimateandthematerialsavailable.Forexample,inhot,drycountrieshouseswithtinywindows ......（本文共 5884 字 ）     [閱讀本文] >>