但是潜水人员在船尾部发现了一个由金、银以及高级陶瓷打造的收藏品，这件收藏品的意义更加神秘。
But at the stern of the ship, divers found a trove of gold and silver and high-grade ceramics whose significance is more mysterious.
并且甚至可能是他们足够聪明去拥有一种由一些实在的东西制作的货币，如由金、银或各种金属制作的。
And it might even be they were smart enough to have a currency that was backed by something real, like gold or silver or various metals.
这一法则是在大约400年前，由伽利略•伽利雷那个著名的比萨斜塔实验所证明的，当时他在塔顶同时释放球型炮弹和毛瑟枪子弹，以及由金、银、木头制成的小球。
This principle was famously demonstrated by Galileo Galilei some 400 years ago when he simultaneously dropped cannon and musket balls, and balls made of gold, silver and wood, from the Tower of Pisa.
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