北京地铁9号线 “列车运行前方是终点站 国家图书馆站 请携带好随身物品准备下车。国家图书馆站 是换乘车站 换乘地铁四号线的乘客 请在国家图书馆站下车 The next station is National Library the terminal of the train. Please get ready for your arrival and make sure you have all your belongings with you. National Library is a transfer station. Passagers for Line. 4 please prepare to get off.”