means of line communication

例句：

1. 1. The teacher gave us a means to solve the problem.
   老师给了我们一种解决问题的方法。
2. 2. He used his experience as a means of guidance.
   他利用自己的经验作为指导。
3. 3. The new policy is meant to improve efficiency.
   新政策旨在提高效率。