used totellsomeone that,despitebeingpleasednow, they will not bepleasedlaterwhen things do nothappenasexpectedorplanned:
到时候就笑不出来了，得意变失意She'spleasedwith herpromotionbut she'll belaughingon the othersideof herfacewhen sheseestheextrawork.她很高兴自己能获得晋升，不过等她明白自己要多干不少工作时恐怕就笑不出来了。