directive function

例句：

1. 1. The teacher gave the students clear instructions on how to solve the problem.
   老师向学生们清晰地说明了如何解决这个问题。
2. 2. The director directed the actors to perfect their lines before the performance.
   导演指示演员们在表演前练习台词。
3. 3. The company's new policy is designed to be directive and easy to understand.
   公司的新政策旨在具有指导性和易于理解。