216．a word in one's ear 私房话，秘密话

　　217．on earth究竟，到底，全然

　　218．with ease (=easily) 容易，不费力

　　219．at (one's) ease ( = without worry or nervousness) 自在，不拘束

　　220．put sb. at his / her ease (=free sb. from worry or nervousness) 使某人感到无拘束

　　221．economize¹ on (=save sth. instead of being wasteful) 节省

　　222．have an effect on 对……有影响

　　223．be in effect (=be in operation) 有效

　　224．go into effect 生效。(近：come into effect; take effect; be brought into effect)

　　225．in effect (=in fact, really) 实际上