成语名称：敲门砖：a brick picked up to knock on the door and thrown away when it has served its purpose--a stepping-stone to succ...
成语名称：磨砖成镜：成语近义： 炊沙作饭(chuī shā zuò fàn)：煮沙子作饭。比喻徒劳无功，白费力气。磨砖作镜(mó zhuān zuò jìng)：磨砖头成镜子。比喻事情不能成功攻大磨坚 磨铅策蹇 磨棱刓角 磨昏抉聩 磨刀不误...
小美情感网
