(ér, ㄦˊ) and; as well as; and so; but (not); yet (not); (indicates causal relation); (indicates change of state); (indicates contrast) [CE-DICT]
对
(duì, ㄉㄨㄟˋ) couple; pair; to be opposite; to oppose; to face; for; to; correct (answer); to answer; to reply; to direct (towards sth); right [CE-DICT]
于
(Yú, ㄩˊ) surname Yu [CE-DICT]
(yú, ㄩˊ) in; at; to; from; by; than; out of [CE-DICT]
先
(せん) (adj-no,n) (1) former; previous; old; (n) (2) first move (in go, shogi, etc.); opening move [EDICT]
(さき) (n,adj-no,n-suf,pref) (1) previous; prior; former; some time ago; preceding; (2) point (e.g. pencil); tip; end; nozzle; (3) head (of a line); front; (4) ahead; the other side; (5) the future; hereafter; (6) destination; (7) the other party; (P) [EDICT]
(xiān, ㄒㄧㄢ) early; prior; former; in advance; first [CE-DICT]