thestickisbehindthedoor.拐仗在门的后面。someoneisatthebackofthat.有人在那门的后面。you'llhavetothumponthedoororhe'llneverhearyouinthebackroom.你是用力捶门,不然他在后面房间里怎么也听不见。abackofthehouse.在房子后面thedoorfelltobehindhim.门在他后面自动关上了。whenthedoorswungtobehindme,ifoundthatididnottakemykeys.门在后面关上时,我发现没带钥匙。