光与黑暗中的视觉
Light & Seeing in the Dark
观察发现，黑暗中的物体只有在被光源照亮时才能被看见
Observe that objects in darkness can be seen only when illuminated by a light source
学习证据 / Evidence
- 解释我们需要光才能看见物体——没有光源时，周围一片漆黑
- 描述一个观察结果，说明物体只有在光线照射到时才会变得可见
- 区分光源（太阳、手电筒、灯）和只是反射光的物体
- Explain that we need light to see objects — without any light source, it is completely dark
- Describe an observation showing objects become visible only when light reaches them
- Distinguish between light sources (sun, torch, lamp) and objects that just reflect light
评估问题 / Assessment
如果{{name}}走进一间完全黑暗的房间，能不能解释为什么在打开手电筒之前什么都看不见？
If you go into a completely dark room with {{name}}, can they explain why they can't see anything until a torch is switched on?