21-30组

21长远利益

interest in the long run

22有其自身的优缺点

has its merits and demerits/ advantages and disadvantages

23扬长避短;

exploit to the full one' s favorable conditions and avoid unfavorableones

24取其精华，去其糟粕

take the essence and discard the dross

25对.有害

do harm to / be harmful to/ be detrimental to

26交流思想/情感/信息

exchange ideas/emotions/ information

27采取有效措施来..

take effective measures to do sth.

28..的健康发展

the healthy development of ..

29更不要说

not to speak of/not to mention/let alone

30有利有弊

every coin has two sides.