chalkrail

例句：

1. 1. The teacher moved the chalkrail to the side of the room.
   老师把粉笔栏杆移到了教室的一侧。
2. 2. The students lined up along the chalkrail for the exam.
   学生们沿着粉笔栏杆排队准备考试。
3. 3. The chalkrail was stained with fingerprints from the previous student's hand.
   粉笔栏杆上沾满了前一位学生的指纹。