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.