贝壳

蜗牛有很长的, 潮湿和, 当然, 粘液状体. 它们是腹足类软体动物; "gastro" means stomach and "pod" 意思是腿. The snail's mouth is located at one end of its "leg" (the snail's body). 粘液是由一种特殊的 ...