On the annual International Volunteers Day, the world acknowledges the work of millions of people who give their time to help others
(P129Para1)
acknowledge: vt 为…表示感谢 , 承认 ( admit ; express thanks for) (1) acknowledge +n
Do you acknowledge defeat
(2) acknowledge +doing ( 不接不定式 )The opponents acknowledged having been defeated
(3) acknowledge +n
+as /to be… 认为…是…I acknowledge your statement to be true
He is acknowledged to be one of the greatest writers
(4) acknowledge +that…The opponents acknowledged that they were defeated
…of Chinese youth who want to make a contribution to society, and the work they are doing is important
(P129 Para1)make a contribution/ contributions to / towards + n /doingIt is our duty to make a contribution to protecting the environment
以下 to 都是介词be used to