represent  用来表示“代表某人/某个团体/政府等”“某种标志代表什么”“某物(书、雕塑等)表现的是什么”和“把某人/物描绘成什么”

on behalf of 只能用作状语，表示“代表/代替某人”

stand for  往往用来表示“(字母、数字、符号等)代表/象征什么”

练习：

[选词填空(represent/on behalf of/stand for)]

(1) He accepted the invitation ___________ the whole class.

(2) The letter A can ____________ several sounds in English.

(3) He was chosen to___________our school at the meeting.

答案：(1) on behalf of  (2) stand for   (3) represent