生物学家说,飞蛾在由蛹变茧时,翅膀萎缩,十分柔软,在破茧而出时,必须要经过一番痛苦的挣扎,身体中的体液才能流到翅膀上去,翅膀才能坚韧有力,才能支持它在空中飞翔。一天,有个人凑巧看到一只茧在蠕动,好像有蛾要从里面破茧而出,于是他饶有兴趣地准备见识一下破茧成蝶的过程。但随着时间一点点过去,他变得不耐烦 Biologists say that when the moths become cocooned by pupae, the wings shrink and are very soft. When the cocoon emerges, the moths must undergo a painful struggle so that body fluids in the body can flow to the wings and the wings can be tough and powerful In order to support it in the air. One day, someone happened to see a cocoon creeping like a moth cocooned out of the inside, so he was intending to see the cocoon into a butterfly with great interest. But as time passed, he became impatient