19. easy → effortless毫不费力的

　　【例句】

　　It's an effortless way to kick the smoking habit.

　　这是一种毫不费力的戒除烟瘾的方法。

　　20. easily → with ease 轻易地;effortlessly 毫不费力地

　　【例句】

　　①A horse can maintain this position effortlessly， thanks to an ability to lock its leg joints into place. (bbc.co.uk)

　　马能毫不费力地保持这种姿势，由于一种能力能将它的腿部关节锁定到合适位置。

　　②China have recoverd from the global financial recession and can maintain its economic growth with ease.

　　中国已经从全球金融衰退中恢复过来，并能够轻松地保持其经济增长。

　　21. It is easy (for sb/sth) to do sth. → It takes little/no effort (for sb/sth) to do sth. (对于某人/物来说)，做某事不怎么费力。

　　【例句】

　　It takes little effort for China to maintain its economic growth.

　　中国可以轻易地保持其经济增长。

　　22. make an effort to do sth 努力做某事 → pour a lot of effort into sth 对某事投入大量精力， make an endeavor to do sth(endeavor作名词)努力做某事， endeavor to do sth(endeavor作动词)努力做某事， try hard to do sth 努力做某事，try desperately to do sth 奋力做某事

　　【例句】

　　We college students should make an endeavor to promote the environmental awareness.

　　我们大学生应该努力宣传环保意识。

　　23. enough (adj) →abundant， adequate， sufficient 充足的

　　【例句】

　　①The old methods weren't adequate to meet current needs. (Collins)

　　老方法不足以能满足目前的需要。

　　②We need sufficient time to deal with the problem. (Longman)

　　我们需要足够的时间来处理这个问题。

　　24. enough (adv) → abundantly， adequately， sufficiently 充足地

　　【例句】

　　Students must reach a sufficiently high standard to pass. (Longman)

　　学生必须达到足够高的标准才能通过。