许多大学生在上海世博会上做志愿者的翻译：Made on a number of University students at the Shanghai World Expo volunteers 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

Many college students volunteer at the Shanghai World Expo

Made on a number of University students at the Shanghai World Expo volunteers

Many university students are the volunteer at the Shanghai World Expo

Many university students at the Shanghai World Expo volunteers do

Made on a number of University students at the Shanghai World Expo volunteers