回複：回複：回複：路璐，你做得比我好多了。

http://seekingalpha.com/article/256973-why-silver-is-grossly-undervalued-and-the-myth-of-the-primary-silver-mine?source=yahoo

That article said, "the price-ratio of silver to gold (which has averaged roughly 15:1 over 5,000 years) is currently at the still-extreme level of more than 40:1, despite the explosion in the price of silver in 2010. Thus if gold is cheap, then silver is dirt-cheap."