今天科技活动课的内容是观察显微镜下的世界。上课了,老师给我们每组一台显微镜和一片椴树树皮的切片让我们看。切片上的“小球”在显微镜下成了红绿交叉的“大网”,但还是有点看不清楚。于是,我们调节反光镜、升降机和滤光器,终于调清楚了。我们还在看时,下课铃响了,有的同学 The content of science and technology activity class today is to observe the world under the microscope. Class, the teacher gave us a microscope and a piece of lime tree bark slices let us see. Slice on the “ball” under the microscope became a red and green “big net”, but still a bit not clear. So, we adjust the mirrors, lifts and filters, finally adjusted. When we are still watching, the bell rang, some students