project和plan 和program在表达意思上什么区别`

project一般表示比较大的工程,项目
They are trying to finish the project soon.
program 节目,程序.
There are many programs to choose for the meeting.
plan 计划
He has planed to go to the USA.

plan; 计划
program; 节目,程序,计划
project; (工程\工作)项目,课题