protest note

例句：

1. 1. The student wrote a protest note to the school board about the unfair treatment.
   学生给学校董事会写了一封抗议信，抱怨不公平的待遇。
2. 2.She sent a protest note to the government demanding immediate action on the issue.
   她向政府发送了一封抗议信，要求立即对这个问题采取行动。
3. 3. The teacher received a protest note from a parent expressing concern over the child's education.
   老师收到了一封来自家长的抗议信，表达了对孩子教育的担忧。