authenticate
/ Rractical experience of sth 对某事物没有实际经验的
armchair critics 空谈的批评家
an armchair traveller, ie sb who reads or hears about travel but does not travel himself 神游旅行者（只阅读或听说关於旅游的事而不亲身旅行的人）
armchair theatre, eg plays on radio or TV 广播剧（如无线电或电视广播的戏剧）.