Verb:

1. have recourse to or make an appeal or request for help or information to;

   "She called on her Representative to help her"
   "She turned to her relatives for help"
   

1.要求;呼吁;号召
If youcall on someoneto do something orcall upon themto do it, you say publicly that you want them to do it.

e.g. One of Kenya's leading churchmen has calledon the government to resign...
肯尼亚一位高级宗教人士要求政府下台。
e.g. Frequently he was called upon to resolve conflicts.
不断有人要求他出面解决冲突。

2.(短暂)拜访,探访，看望
If youcall on someone orcall upon someone, you pay them a short visit.

e.g. Sofia was intending tocallon Miss Kitts.
索菲娅打算去拜访基茨小姐。

1. 号召：5. 高二学生张华生,重病住院,需要进行手术. 但该生家境贫寒,无力支付医疗费用(medical cost). 我们号召(callon)大家支援,款额不限. 请把钱交给班主任. 班主任必须在本周星期五以前交到校长办公室.

2. 拜访：call off 取消 |callon 拜访 | care for 喜欢

3. 访问：call not started 呼叫未开始 |callon 访问 |call request 电话挂号

4. 呼吁：Un nuclear watchdog 联合国监测机构 |Callon 呼吁 | Nuclear bomb 核弹

He called on the workers to fight for their rights.

他号召工人为争取自己的权利而斗争。

I'd like to call on you this Sunday.

我想这个星期天来找你。

I'm going to call on one of my former classmates.

我要去看望我的一位老同学。

You'd better call on your friends to help you.

你最好请朋友来帮你。

One of Kenya's leading churchmen has called on the government to resign...

肯尼亚一位高级宗教人士要求政府下台。

Frequently he was called upon to resolve conflicts.

不断有人要求他出面解决冲突。

Sofia was intending to call on Miss Kitts.

索菲娅打算去拜访基茨小姐。

A good friend is someone you can always call on when things get tough.

好朋友就是当遭遇困境时,你永远可以向他求助的人.

He neglected to call on his aunt, and got into her bad books.

他忽略了去看他的姑姑, 因而得罪了她.

We often call on directly our friends.

我们经常直接拜访朋友.

Why not call on me tomorrow?

你干吗不明天就来看我 呢 ?

She paid a short call on Lao Wang on her way home.

她在回家的路上去看望了老王.

I had like to see the Toms'new house, why don't we call on them?

我想去看看汤姆家的新房子, 我们为何不登门拜访他们一下?

I'll call on you when I'm free.

等我空闲下来再去拜访你.

I will call on you.

我会叫到你.

The government call on the people to close ranks against the enemy.

政府号召人民联合起来反对敌人.

call on me tomorrow morning and ( are ) welcome.

明天早上来拜访我,欢迎欢迎.

Please call on me when it is convenient for you.

请在您方便的时间来找我.

I'll call on you in my spare time.

有空我去找你.

I meant to call on you. But I was so busy.

我是想来看望你的, 但是我太忙了.

Please feel free to call on us whenever you like.

你可以随时给我们打电话.

Twice he suggested that they call on neighbors.

有两次他提出他们要去邻居处串门.

I'm afraid I a call on another line.

对不起我别线有电话进来.

I call on: the protection of nature, love of our lives now.

我呐喊: 维护大自然, 保护咱们生涯的家园吧.

We call on the international community to continue the campaign to isolate the apartheid regime.

我们呼吁国际社会将孤立种族隔离政权的运动进行下去.

She'll call on you this afternoon.

她今天下午要来见你.

I like that you should call on me frequently.

我喜欢你经常来拜访我.

In case of difficulty, just call on me.

如有困难, 找我好了.

I'm going to call on one of my former classmates.

我要去看望我的一位老同学.

The Venerable Master Kao had gone to call on a cousin that morning.

老太爷这天早晨就到他的表弟唐家去了.

We can pinpoint the exact location of whoever answers my call on a cell phone?

无论是谁用手机接我的电话用这个我们都能得到精确的地址?

Emma Walton had to call on all her reserves of stamina to win the 10 000 metres.

埃玛·沃尔顿不得不动用她所贮备的全部耐力来赢得一万米赛跑.

Sofia was intending to call on Miss Kitts.

索菲娅打算去拜访基茨小姐。

Why should they get first call on the best property?

凭什么最好的房产尽着他们先挑？

• call on someone's services要求某人协助...
• call down on someone's head诅咒某人,祈求降祸于...
• call on号召
• money on call随时可收回的借款...
• on call随时可用, 随时到...

call on，see，visit，drop in

这些动词或词组均含有“拜访，访问”之意。

call on社交上的正式用语，指无目的、礼节性的短暂拜访，访问者与被访问者之间一般只有社交或公务关系。

see常用词，含义广泛，既可指接受他人来访，又可指去访问他人。

visit正式用词，强调出于工作需要的访问，也指亲戚朋友间的看望。

drop in多指在计划之外或事先未打招呼的偶然、顺便访问。也可指参观。