dualin

例句：

1. 1. He has a dual role as both a teacher and a coach.
   他既是教师又是教练，具有双重角色。
2. 2. The company is facing a dual challenge of increasing profits and reducing costs.
   该公司面临着增加利润和降低成本的双重挑战。
3. 3. The government has implemented dual pricing strategies to address the issue.
   政府实施了双重定价策略来解决这个问题。