对敌我双方的优劣短长均能透彻了解。 -----------------国语辞典：对彼我双方的情形都有充分的了解。《孙子．谋攻》：「知彼知己，百战不殆。」《隋唐演义．第一八回》：「若凭著一勇到底，制服他不来，反惹出祸患，也不是英雄知彼知己的伎俩。」也作「知己知彼」。英语 to know the enemy and know oneself (idiom, from Sunzi's /The Art of War/)
◎ 知遇 zhīyù[have found a patron or superior appreciative of one’s ability] 相知才识,优遇启用 知遇之恩-----------------国语辞典：受人赏识而被优待或重用。《北史．卷二六．宋隐传》：「帝称善者久之，因是大被知遇，赐名为弁，意取弁和献玉，楚王不知宝之也。」
◎ 知人善任 zhīrén-shànrèn[to use a man according to his ability] 熟知各人的能力,分别委以胜任的职务-----------------国语辞典：能识别、拔擢人才，并能依据其专长而加以任用使能发挥所长。明．沈采《千金记．第一七出》：「军师，你知人善任，何必大谦。」英语 expert at appointing people according to their abilities (idiom), to put the right people in the right places