实体镜的

例句：

1. 1. The physics lab has a large screen for the demonstration of physical phenomena.
   物理实验室有一个大屏幕用于演示物理现象。
2. 2. The astronomers used the telescope to observe the stars in the night sky.
   天文学家们使用望远镜观察夜空中的星星。
3. 3. The doctor examined the patient with the aid of an electronic stethoscope.
   医生用电子听诊器检查病人。