田野里人们安装了一种叫做“黑米灯”的装置．白天这种灯不亮，天一黑就能自动点亮．它发出的“黑光”即紫外线能够引诱田野里的害虫──飞蛾赴灯而来再将它们杀死．天亮后这种灯又会自动熄灭，不必用人工去控制。真是奇妙！实际上，这种灯使用了初中物理课本中介绍过的光敏电 People in the fields installed a device called “black rice lamp”. During the day, this light does not shine, and it will automatically light up as soon as it is dark. The “black light” it emits, namely the ultraviolet rays, can induce pests in the fields - moths go to the lights and kill them. After dawn, the light will turn off automatically, eliminating the need for manual control. It is wonderful! In fact, this kind of lamp uses the photosensitive electricity introduced in junior high school physics textbooks.