势均力敌

势均力敌：shìjūnlìdí　基本解释：[balanceofforces;theirstrengthandadvantageofsituationmatcheachother]双方势力相当,不分高下吕惠卿始谄事王安石…及势钧力敌,则倾陷安石,甚于仇雠。——《宋...