upon graduation 与 upon graduating用法差别

upon=on,意思是“一.就.”
upon graduation和upon graduating都有“一毕业,就.”的意思.其中前者更常用.
具体的用法差别,肯定是由graduation和graduate的词性不同所导致的.
upon graduatin加from,表达更全面的信息.比如upon graduating from xx college.从xx学院毕业后,.