Question

call at, call out, call on, call up, call off, 分别是什么意思啊？最好能举例说明一下，谢谢啦..

Answer 1

call at到…进行短暂访问
He called at Mr. James this afternoon.
他今天下午到詹姆斯先生家去拜访了他。

call out
大声喊叫; 召集; 命令(工人)罢工; 使跃出; 向...挑战; 要求和...决斗
For further details, please call out company.
欲知详情，请致电本公司
call out loudly, as of names or numbers.
把名字或数字大声说出来。

Call on和call at的意思一样，都是"拜访""访问"，但call on后接表示人的名词或代词，call at 后接表示地点或场所的词语。试比较：
I called on the Smiths yesterday.
我昨天拜访了史密斯一家人。
I called at the Smith's yesterday.
我昨天去了史密斯家。
I called on the doctor yesterday.
我昨天去拜访了医生。
I called at the doctor's yesterday.
我昨天去了医务室。
另外，call on还可以"号召"，后面往往接动词不定式作宾语补主语。如：
The headmaster called on the students to work harder.校长号召学生们更努力地学习。

call up
召唤, 使想起, 提出, 打电话给
Forgive me so early to call up you please.
请原谅我这么早给你打电话。
She can still call up scenes of childhood.
她仍能想起儿时的情景。

call off 取消, 把（注意力）转移开
The president's visit was called off at the eleventh hour.
总裁的这次访问到时取消了。
Rescuers had to call off the search due to worsening weather.
由于天气越来越坏，救援人员只得停止搜索。

此外，我还加了一个，呵呵。希望对你有帮助。
call in叫(某人)进来; 来访
Call in this evening if possible.
可能的话今晚来一趟。
找〔请〕来
How many friends will you call in?
你将邀请多少位朋友?

Answer 2

call at 拜访，访问；停靠（车站）
Does this ship call at our port?这艘船在我方港口停靠吗？
call out 唤起；出动；大声叫唤
You must stand up when your name is called out.叫到你的名字时，你必须起立。
call on 访问，拜访；号召，请求
We call on the smith last week.上周我们拜访了史密斯一家。
call up 打电话给；召集；使想起；提出
If you want my help, just call up.你如果需要我的帮助，来个电话就行。
call off 取消；依次叫名；叫走
Shall we call off the meeting?我们应该取消这次会议吗？

需要注意的是：call at和call on都有拜访的意思，但前者后面接物call at sth.，后者接人call on sb.