(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
外交史
(n) history of diplomacy; history of foreign policy[edict]
上
shàngㄕㄤˋ
on; on top; upon; first (of two parts); previous or last (week etc); upper; higher; above; previous; to climb; to go into; above; to go up; to attend (class or university); third tone of putonghua[cedict]
一定
yī dìngㄧ ㄉㄧㄥˋ
surely; certainly; necessarily; fixed; a certain (extent etc); given; particular[cedict]