知根知底指有较深入的了解。例我们是老朋友啦彼此都知根知底。英know inside out;[查看详情]

如指诸掌《论语八佾》：“或问褅之说。子曰：'子知也；知其说者之于天下也其如示诸斯乎！'指其掌。”后用“如指诸掌”比喻对事情非常熟悉了解。[查看详情]

浅显易懂浅显：浅近明显。道理或寓意浅显容易理解、明白。[查看详情]

洞若观火形容对事物观察得清楚明白就像看火一样。例老祖台察吏安民洞若观火。——清钱谦益《致郎制台》英as clearly as a blazing fire; see very clearly as through looking at fire;[查看详情]

不足齿数不足以相提并论同等看待。[查看详情]

知己知彼对自己和对方都了解得很透彻。英knowing one's own situation and that of the enemy;[查看详情]

如数家珍数：点数。家珍：家藏的珍宝。如同点数家里的珍宝。比喻对所讲的事情非常熟悉。例蒙蒲清为一一说明真正是如数家珍。——郭沫若《洪波曲》英as if enumerating one's family valuables—very familliar with one's subject;[查看详情]

一目了然一眼就看得很清楚。英as clear as day; see with half an eye;[查看详情]

旁观者清对同一事物局外人比当事者看得全面看得清楚。例俗语说：“旁观者清”。这几年姑娘冷眼看着或有该添该减的去处，…——《红楼梦》英the on-looker is clear-headed; the spectator sees the game best;[查看详情]

一清二楚非常清楚。英be ferfecely clear; as clear as daylight;[查看详情]