setback

　　n. a difficulty or problem that delays or prevents sth. ，or makes a situation worse挫折；阻碍

　　The team suffered a major setback when their best player was injured秀的队员受了伤，使得这支队伍的实力大打折扣。

　　restore [同]recover

　　v. to bring back a situation or feeling that existed before恢复（某种情况或感受）

　　The most recent operation restored his sight. 最近的一次手术使他恢复了视力。