上下
?high and low; old and young
?from top to bottom;up and down
?relative superiority or strength
?about;nearly; or so; or thereabouts
?go up and down
大河～，頓失滔滔。(毛澤東詞《雪》)And up and down the Yellow River,all the endless waves are lost to sight.(Mao Zedong’s poem Snow)/兩個(gè)球隊(duì)的實(shí)力不相～。The two teams are equally matched./舉國(guó)～whole(or entire)nation; whole country