如001 and 002所言, 二者皆是代表的意思, 他們有時通用, 有時不可
on behalf of 代表者一定是人, 被代表者可是人或人組成的團體,機構
On behalf of the entire company, I would like to thank you for all your work. Unfortunately, George cannot be with us today so I am pleased to accept this award on his behalf.
The lawyer spoke on behalf of his client.
I speak on behalf of Tom 有點替Tom說幾句話的口氣
represent 就不限在人或人組成的團體,機構, 但是用在人時, 有比較強烈的代表性, 隱含被授權的意味
The flag represents the country.
The dove represents the peace.
The lawyer represents his client to speak 授權代表
I represent Tom to speak to you 隱含被授權的意味
你不能說 The flag is on behalf of the country, or on behalf of the country the flag flies in the parade, or on half of the peace a flock of dove was released to the sky.