A closed-shop agreement的用法和样例：
- The union is asking the management to agree to a closed shop.
- There was a closed shop policy in this company in the past.
- The London stock exchange was a closed shop, marked by an antiquated division between brokers who brought the business and jobbers who made markets in shares.
- Nuclear physics is a closed book to me.
- Nuclear physics is a closed book to most of us.
- He soon brought the meeting to a close.