the generation gap
noun [ S ] uk/dʒen.əˈreɪ.ʃən ˌɡæp/ us/dʒen.əˈreɪ.ʃən ˌɡæp/
代沟，两代人之间的隔阂
a situation in which older and younger people do not understand each other because of their different experiences, opinions, habits, and behaviour
She's a young politician who manages to bridge/cross (= understand both groups in) the generation gap. 作为一个年轻的政治家，她设法弥合了新老两代政治家之间的隔阂。