1. The teacher testified to the pupil's ability.
   老师证明那个学生的才能。
2. Pupils congregated round the teacher.
   小学生们聚集在老师的周围。
3. The school streams pupils into three classes.
   学校按智力把学生分成三个班。
4. A dentist inspects the pupil's teeth twice a year.
   一位牙医一年两次为那个小学生检查牙齿。
5. The teacher asked the pupil to put his hand down.
   老师叫这个小学生把手放下。

　3个名词解释