properly primitive binary quadratic form

例句：

1. 1. She properlyprepared the meal for her guests.
   她适当地为客人准备了饭菜。
2. 2. Theteacher properly guided the studentsthrough the lesson.
   老师适当地指导了学生们学习。
3. 3. Heproperly handled the situation toavoid any misunderstandings.
   他适当地处理了情况以避免任何误解。