放大镜是人们常用的观察工具之一。早在一千多年前,人们就已把透明的水晶或透明的宝石磨制成放大镜了。今天,放大镜在我们的生活、工作、学习中被广泛使用。科学家们观察微生物,地质学家勘测地质,公安人员观察现场寻找纤维和指纹,都会使用放大镜。想亲手做一个放大镜吗?你可以这样做: Magnifying glass is one of the commonly used observation tools. As early as a thousand years ago, people had polished transparent crystal or transparent gemstone into a magnifying glass. Today, magnifying glass is widely used in our life, work and study. Scientists observe the microbes, geologists survey geology, public security personnel to observe the scene to find fiber and fingerprints, will use a magnifying glass. Do you want to make a magnifying glass yourself? You can do it like this: