smoke and mirrors
noun [ plural ] mainly US uk/ˌsməʊk ən ˈmɪr.əz/ us/ˌsmoʊk ən ˈmɪr.ɚz/
烟幕，障眼物
Something that is described as smoke and mirrors is intended to make you believe that something is being done or is true, when it is not
The new budget isn't smoke and mirrors; it's an honest attempt to reduce the deficit. 新预算不是在搞障眼法，是真的试图削减开支。