for concern oneself about担心
concern his about关心
concern oneself about with关心
concern oneself about关心;忙于;为;挂念
concern oneself about sth从事;忙于
concern n about关心;担心
concern oneself about ith关怀
concern just about关系
China Expresses 'Concern' About Ko中国对朝鲜半岛紧张局势表示关注