马歇尔举例说，CSIRO最新研发出一种不使用氰化物的黄金提纯法，因传统的氰化物黄金提纯法对环境危害非常大，很多国家都希望能找到一种对环境污染小的黄金提纯方法。
Marshall took the example that CSIRO has recently developed a gold purification method without using cyanide. Because the traditional cyanide gold purification method is very harmful to the environment, many countries hope to find a way to purify gold with little environmental pollution.