inactive voice

例句：

1. 1. The teacher asked the students to raise their hands when they understood the lesson.
   老师要求学生在理解课程内容时举手。
2. 2. The inactive voice of the sentence is "He is reading a book."
   句子中的不活跃部分是“他正在读书。”
3. 3. Inactive voices are often used to indicate that something is happening but not actively being discussed or performed.
   不活跃的声音通常用来表示某事正在发生，但并未被积极讨论或执行。