call on基本解释
号召；拜访；请求
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verb
1. have recourse to or make an appeal or request for help or information to
e.g. She called on her Representative to help her
She turned to her relatives for help
Synonym: turn
1. 要求;呼吁;号召
If you call on someone to do something or call upon them to do it, you say publicly that you want them to do it.
e.g. 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。
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 you call on someone or call upon someone, you pay them a short visit.
e.g. Sofia was intending to call on 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(call on)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 | call on 拜访 | care for 喜欢
3. 访问：call not started 呼叫未开始 | call on 访问 | call request 电话挂号
4. 呼吁：Un nuclear watchdog 联合国监测机构 | Call on 呼吁 | Nuclear bomb 核弹
