cause, source 和 origin 的差別在哪裡？如果不好說明，請提供一些例句。

The difference lies in connotation and convention. All are good synonyms of each other but cause is usually used in reference to an issue, is 'he caused the traffic jam' while source is used for materials, ie 'the wood is sourced from the mountains' while the origin can refer to a person's origin or the origin of an item, is 'her family originated from Spain' and 'the package's origin is in Canada'. Origin is not as common to describe an event like the other two, but if it were it would be used to describe a long, multistep event, such as 'the war's origin was a conference between leaders'. Source is also used to describe events still happening such as 'he is the source of all my stress'.