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在自然教学中,用投影仪投影实物,演示教具,都能取得满意的教学效果。讲《动物怎样在地上行动》一课时,把捉来的蜈蚣、蜘蛛,放进透明度好的塑料盒中投影,可以清楚地观察到它们各有几条腿?是怎样爬行的?把蝗虫或甲虫的脚放在投影仪上,经放大后,可看清昆虫脚的特点,了解它们为什么不但能抓爬树,还能在植物叶子的边缘上爬行的原因——有爪。讲《动物怎样在空中飞行》一课时,把蜻蜓、蝗虫的翅进行投影,能清楚地看到昆虫的翅的特点和结构:膜质的、透明的,以及支持翅的翅脉。
In the teaching of nature, with the projection projector in kind, teaching aids, can achieve satisfactory teaching results. Speaking of “How animals move on the ground” class, the caught centipedes, spiders, into a good transparency plastic box projection, you can clearly observe each of them legs? How to crawl? The locust or beetle Feet on the projector, enlarged, you can see the characteristics of insects feet, why they not only can catch the tree, but also in the leaves of plants crawling on the reason - claws. When it comes to a lesson on how animals fly in the sky, the dragonfly and locust's wings are projected to clearly show the characteristics and structure of the insect's wings: membranous, transparent and supporting the winged veins.