a polytechnic exhibition的用法和样例：
- There is going to be a polytechnic exhibition tomorrow.
- After completing her last year in upper school, Aisha was accepted for a polytechnic journalism course.
- The exhibition was a summation of his life's work.
- I am the programme manager of a Polytechnic in New Zealand which, curiously, has absolutely no international students at the moment.
- Let's take a look round the exhibition.