on behalf of/in behalf of

【问】 The minister worked hard all his life in behalf of the poor.

in behalf of与on behalf of有无区别?

【答】 on behalf of与in behalf of都作“代表”、“代表……的利益”、“为……的利益”解。但是后者为美国英语。

1. I am writing on behalf of my mother，to express her thanks for your gift. (Wood)

我代表我母亲给您写信，以表达她对您送礼物的感激之情。

2. The president can't be here today，so I'm going to speak on his behalf. (LDAE)

今天校长不能来了，所以我要代表他发言。

3. A carnival was planned in behalf of the church(MD)

狂欢活动是以教会的名义计划的。

请做下面的英语试题：

Historian Mary Williams vigorously on and for women. (TOEFL，86. 3)