对: answer; reply某: certain; some事物: thing; object; arrangement了如指掌: know对某事了如指掌: have sth. pat对…了如指掌: have something at one’s fingertips了如指掌: know … like the palm of one's own hand; as plain as pointing to one's hand; be thoroughly familiar with …; clear like pointing at a palm; have fully grasped a subject, a situation, etc.; have sth. at one's fingertips; know … as a person knows his ten fingers; know … as well as a beggar knows his bag; know … like a book; know sth. like the back of one's hand; know … to one's fingertips; one has the knowledge of sth. so one's palm.; 他对这一带地形了如指掌。he knows the terrain of this locality like the back of his hand完全了解, 了如指掌: to know something backwards产地来源证身分了如指掌: cos id already know对所有的规则了如指掌: thoroughly conversant with all the rules了如指掌, 知道得很清楚: know from a to z他对矿残业了如指掌: his intimate knowledge of the coal industry面对某事物: confronted by sth他对这一带地形了如指掌he: knows the terrain of this locality like the back of his hand对某事物不利: tending to prevent or discourage sth harmful对某事物得意: take pleasure or pride in sth易如指掌: easy as pointing at a palm与某事物相对立, 反对某事物: be opposed to sth对某事物表示不满: express one's displeasure at sth对某事物表示轻视: show contempt for sth对某事物不满意: be unsatisfied with sth对某事物不能忍受: intolerant of sth对某事物等闲视之: make light of sth treat sth as unimportant对某事物缄默不语: keequiet about sth keesth quiet say nothing about sth对某事物实行抵制: place/put sth under a boycott