协同作用 xié tóng zuò yòng 各种分散的作用在联合中使总效果优于单独的效果之和的相互作用。
协同作战 xié tóng zuò zhàn 通同作弊 tōngtóng zuòbì[collude in cheating;gang up to cheat;act fraudently in collusion with sb