我们不靠天,也不靠地,我们靠自己。“妈妈!为什么我们从生下来,就要背这个又重又硬的壳呢?真是累死了!”小蜗牛有一天问妈妈。“因为我们的身体没有骨骼的支撑,只能爬,爬又爬不快。”妈妈说。“毛虫姐姐没有骨头,也爬不快,为什么她却不用背又重又硬的壳呢?” We do not rely on the sky, nor on the ground, we rely on ourselves. “Mom! Why do we have to give birth to this heavy and hard shell? Really exhausted!” “Little snail one day asked her mother. ”Because our body without the support of the bones, can only climb, climb and climb unpleasant. “ Mom said. ”Caterpillars sister no bones, but also climb unpleasant, why she does not have the back hard and heavy shell?"