原文：In the last 25 of the many thousands of years which separate the discovery of electrum from the discovery of electrons, we have at last come to realize how much the properties of the former depend on the behavior of the latter.
译文：最近的25年隔离了我们发现金银合金和发现电子的时间，只是直到最近的25年我们才终于认识到金银合金的性质在多大程度上取决于电子的作用。