monotony

例句：

1. 1. The speaker's monotonous voice made the audience restless.
   演讲者的单调声音让听众感到不安。
2. 2. The movie was filled with repetitive scenes, making it monotonous to watch.
   电影中充满了重复的场景，观看起来令人感到单调。
3. 3. The teacher's uniformity in grading made it difficult for students to understand the criteria.
   老师在评分上的一致性使得学生难以理解评分标准。