胸中有数

Explanation: That have a clear understanding of the situation, and my heart bottom. 　　Usage: The main predicate; as predicate, object, attribute; with compliment 　　Source: Mao Zedong, "the working methods of Party Committees," the mind is 'number'. That is, on the situation and problems must be noted that their number, the make a basic quantitative analysis. " 　　Examples: Although he usually reticent, but ~ Thesaurus:  omniscient, tacit understanding, have a tacit understanding; give tacit consent; tacit understanding, boson friends, know sth. as a person knows his ten fingers, as if enumerating one's family valuables— very familliar with one's subject, To understand clearly Into the Huai, understand tacitly; I appreciate your kindness, Minds think alike, knowing one's own situation and that of the enemy, Zhibi confidant