他被任命代表委员会发言。
He has been appointed to ___speak ___on ___behalf ___of the committee.
我相信我代表所有员工发言。
I believe I ___speak ___on ___behalf ___of all employees.
作为律师,她在法庭上代表她的客户发言。
As a lawyer, she ___speaks ___for her clients in court.