blocking course

例句：

1. 1. The teacher had to cancel the blocking course due to a lack of student participation.
   由于学生参与度不高，老师不得不取消这门阻塞课程。
2. 2.The student was assigned to take the blocked course in order to improve his skills.
   学生被分配了这门阻塞课程，以便提高他的技能。
3. 3. The blocked course was difficult for the students to understand, but they persevered and eventually mastered it.
   这门阻塞课程对学生来说很难理解，但他们坚持不懈，最终掌握了它。