[jiān rú pán shí]   

坚    如    磐    石    坚：坚固，结实；磐：大石头。象大石头一样坚固。比喻不可动摇。

坚：坚固，结实；磐：大石头。像大石头一样坚固。比喻不可动摇。

Be as solid as rocks

坚忍不拔    坚壁清野    坚甲厉兵    坚定不移    坚苦卓絶