hard-and-fast rules

例句：

1. 1. The company has a hard-and-fast rule against discrimination against any employee.
   该公司有一项硬性规定，禁止对任何员工进行歧视。
2. 2. The teacher had a hard-and-fast rule that students must complete all homework before class.
   老师有一个硬性规定，学生必须在上课前完成所有的家庭作业。
3. 3. The new policy is a hard-and-fast rule that employees must wear uniforms at all times.
   新政策是一项硬性规定，要求员工在任何时候必须穿着制服。