【incall】英语短语~callatcallincallby三个在用法上有什么区别?

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【答案】 Call in 作请来、找来、召来解,请人来作某种专业的咨询或帮忙的意思.如：
　　Your father is ill,you should call in a doctor at once.你父亲病了,应该马上去请个大夫来.
　　The police have been called in to help make it clear.
　　已请来了警察帮忙把这件事弄清楚.
　　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 by 是“顺道访问”的意思.