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]

了如指掌形容对情况极为清楚。例对他们的活动他完全了如指掌。英have sth.at one’s fingertips; know as one know his ten fingers; know like a book; know as well as a beggar knows his bag;[查看详情]

知彼知己对敌我双方的优劣短长均能透彻了解。[查看详情]

心中有数对于事情比较了解处理起来已有把握。英know what's what;[查看详情]

自知之明能正确认识自己、了解自己的长处和短处。例他真是个毫无自知之明的、狂妄的人。人贵有自知之明。英self-knowledge; wisdom to know oneself;[查看详情]

明察秋毫明细观察秋日兽类的毫毛。极言能敏锐辨别是非观察细微，不受蒙蔽。例明足以察秋毫之末而不见舆薪则王许之乎？——《孟子梁惠王上》英omniscient;[查看详情]