在春季油菜花盛开时,到菜地里捕捉一只菜粉蝶,用一个纸盒将它关闭5-6个小时,待它饥饿时,将它从纸盒中取出,用手轻轻地夹住它的翅,摘一朵新鲜的油菜花,用花心接触菜粉蝶触角基部的口器,这时可以看到:从菜粉蝶的口中伸出一根细长的管子直插花心去吸取花密,这就是菜粉蝶的虹吸式口器。一会儿,待花蜜吸尽后,小管子又象弹簧一样很快缩回去。换一朵 When the rape blooms in the spring, catch a cabbage butterfly in the vegetable field and turn it off for 5-6 hours with a tray. When it is hungry, remove it from the tray and gently grasp it with your hand Of the wings, pick a fresh rape, with flower heart contact Cabbage antenna tentacles at the base of the mouth, then you can see: from the mouth of the cabbage butterfly stick out a slender tube intentions to draw the flower, which Is the butterfly pink siphon mouthparts. For a moment, after the nectar has been exhausted, the small tube retracts as quickly as the spring. For another