鸡蛋碰石头－不自量力

      An egg on a stone – overreach

      It means to overestimate one’s own strength and destroy oneself.

eg.起初我对这场球赛并不看好,认为他们是鸡蛋碰石头自不量力.

       At first I wasn’t optimistic about the game. I thought they were eggs against stones.