各位学长学姐，本人大一，在学曼昆的经济学原理，在书中遇到一点问题想请教一下：储蓄和投资是什么关系？原文是这样的：With the nation saving more ,fewer  resources are needed to make consumption  goods ,and more resources are available to make capital goods,As  a result ,the capital stock increase ,leading to rising  productivity and more rapid growth in GDP.这是什么意思呢？希望能指点迷津，谢谢！