摘要：在英语交际中，"in behalf of"与"on behalf of"犹如一对「同源异义词」——虽共享「为某人/事」的核心语义，却因介词差异承载着不同的使用逻辑。请看：
在英语交际中，"in behalf of"与"on behalf of"犹如一对「同源异义词」——虽共享「为某人/事」的核心语义，却因介词差异承载着不同的使用逻辑。请看：
一、
in behalf of sb
in sb's behalf
(US)为帮助某人；以……名义而做的
in order to help sb
We collected money in behalf of the homeless.
我们为帮助无家可归者而募捐。
The minister worked hard all his life in behalf of the poor.
这位牧师一生都在为穷人辛勤工作。
He worked hard in behalf of his family’s future.
他为了家人的未来努力工作。
He took cooking classes in behalf of their struggling relationship.
为了挽救濒临危机的感情，他报了烹饪课。
They raised funds in behalf of cancer research.
他们为癌症研究筹集资金。
He donated his savings in behalf of cancer research.
他为资助癌症研究捐出积蓄。
She attended couple counseling in behalf of their children.
为了孩子的利益，她参加了婚姻咨询。
She organized a surprise party in behalf of their ten-year friendship.
她为纪念十年友谊策划了惊喜派对。
A carnival was planned in behalf of the church.
狂欢活动是以教会的名义计划的。
She campaigned in behalf of women's rights.
她为支持女性权利而奔走。
She wrote love letters in behalf of their reconciliation.
她为他们的和解写了情书。
I organized this intervention in behalf of your relationship with your dad. 《摩登家庭》S05E18
我策划这次家庭会议，是为了修复你和你父亲的关系。
I fight in behalf of our memories, even when you forget them.
即便你忘了，我也在为我们的回忆而战。《恋恋笔记本》
I fight in behalf of our love story. 《泰坦尼克号》
我为我们的爱情故事而战。
In behalf of love, just kiss her!
因为爱，吻她！《老友记》
I'm here in behalf of your educational potential. 《心灵捕手》
我为了你的教育潜力来这里。
I'm speaking in behalf of all men when I say we don't understand women's hair products. 《当哈利遇到莎莉》
我代表所有男性说一句，我们搞不懂女性的护发产品。（破格使用）
In behalf of the Corleone family, I offer my condolences.
我代表柯里昂家族致以哀悼。《教父》（历史用法现代已被on取代）
这个短语仅在美国英语里有限使用，表示：为帮助某人；以……名义而做的。更强调“为了某一目的或利益”。
当需要避免重复或调整语境时，可使用以下表达替代：
For the sake of：
For the sake of public safety, the event was canceled.
为了公众安全，活动被取消。
He's the hero Gotham deserves, but not the one it needs right now. For the sake of this city, I can be an outlaw. 《蝙蝠侠：黑暗骑士》
他是哥谭应得的英雄，但不是此刻需要的。为了这座城市，我愿成为法外之徒。
In the interest of：
In the interest of fairness, we will review the case again.
为了公平，我们将重新审查此案。
二、
on behalf of sb
on sb's behalf
用法和含义如下：
1.代表（或代替）某人
as the representative of sb or instead of them
正式场景的首选：在法律文件、正式演讲、商务写作中运用。
On behalf of the company, I would like to extend our gratitude.
我谨代表公司致以感谢。
On behalf of the department I would like to thank you all.
我谨代表本部门感谢大家。
I am writing on behalf of my mother, to express her thanks for your gif.
我代表我母亲给您写信,以表达她对您送礼物的感激之情。
Mr. Knight cannot be here, so his wife will accept the prize on his behalf.
奈特先生不能来，因此由他的夫人代他领奖。
She accepted the award on behalf of the entire team.
她代表全队接受了奖项。
The best man gave a toast on behalf of the groom.
伴郎代表新郎致祝酒词。
He apologized to her parents on behalf of his hot-tempered friend.他代表脾气暴躁的朋友向她父母道歉。
Please allow me to thank you for your offer of help on behalf of my colleagues.
请允许我代表我的同事们感谢你主动提出帮忙。
On behalf of everyone here, I'd like to thank you for your speech.
我谨代表在场所有人，感谢你的演讲。
The settlement ends more than four years of litigation on behalf of the residents.
这一和解协议结束了代表居民提起的超过四年之久的诉讼。
Secret Service officer Robin Thompson spoke on behalf of his colleagues.
特工处官员罗宾·汤普森代表他的同僚发表了讲话。
The president can't be here today, so I'm going to speak on his behalf.
今天校长不能来了,所以我要代表他发言。
On behalf of my Government I have the honour to make to you the following communications.
我荣幸地代表我国政府向您转达如下内容。
He spoke on behalf of all the members of the faculty and staff.
他代表全体教职员工讲了话。
The lawyer spoke on behalf of the defendant.
律师代表被告发言。
He signed the contract on behalf of the company.
他代表公司签约。
She acted on behalf of her absent boss.
她代表缺席的老板行事。
On behalf of my heart, I promise to love you forever.
我以心之名，承诺永远爱你。
On behalf of both sides, I tried to resolve their misunderstanding.
我代表双方尝试化解误会。
He acted on behalf of you when negotiating with your family.
他在与你家人沟通时代表你出面。
On behalf of the warden, I welcome you to Shawshank.
我代表监狱长欢迎你来到肖申克。《肖申克的救赎》
On behalf of my client, I demand an immediate retraction. 《金装律师》
我代表当事人，要求立即撤回指控。
In behalf of spontaneity, let's miss the train. 《爱在黎明破晓前》
为了一时兴起，我们错过这班火车吧。
I move to dismiss the case on behalf of my client, who has been wrongfully accused. 《傲骨贤妻》S03E12
我代表被诬告的当事人申请驳回此案。
On behalf of the defense, we challenge the validity of this evidence. 《波士顿法律》S01E05
我代表辩方，对该证据的有效性提出质疑。
On behalf of the 435th Congress, I welcome you to the United States Capitol. 《纸牌屋》S01E01
我代表第435届国会，欢迎各位来到美国国会大厦。
I speak on behalf of all neighbors against the noise. 《绝望主妇》
我代表所有邻居反对噪音。
Leonard asked me to apologize on his behalf. 《生活大爆炸》
伦纳德让我代表他道歉。
On behalf of Earth, we refuse to surrender. 《复仇者联盟》
我们代表地球拒绝投降。
On behalf of the State Department, I confirm the treaty signing. 国务卿女士》
我代表国务院确认签署该条约。
2.因为某人；为了某人
because of sb; for sb
Don't worry on my behalf.
别为我担心。
They interceded with the authorities on behalf of the detainees.
他们为被拘留者向当局求情。
He proposed a toast on behalf of you.
他提议为你干杯。
3.为帮助某人（只有这个用法和含义是它们是重合的）
in order to help sb
She volunteered on behalf of the charity to help the homeless.
她为了慈善机构的利益志愿帮助无家可归者。
They campaigned on behalf of asylum seekers.
他们为政治难民发起运动。
Historian Mary Williams campaigned vigorously on behalf of peace and equal rights for women.
历史学家玛丽·威廉姆斯积极为和平和妇女的平等权利而奔走。
She campaigned in behalf of women's rights.
她为支持女性权利而奔走。
当需要避免重复或调整语境时，可使用以下表达替代：
Representing：
She spoke at the conference, representing her team.她代表团队在会议上发言。
In the name of：
In the name of Lord Voldemort, surrender now!《哈利·波特与死亡圣器》
以伏地魔之名，立即投降！
来源：翅膀英语一点号