根据谢力《爱因斯坦有才就是任性》提供的例子，“This in particular is thecase for the concepts of motion, space, time. The theory ofrelativity is that physical theory which is based on a consistent physicalinterpretation of these three concepts.”

        那么，如果“those discoveries”和“those steps”是指上文的“two great achievements（两项重大成就）”——“Development of Westernscience is based on two great achievements: the invention of the formallogical system (in Euclidean geometry) by the Greek philosophers, and thediscovery of the possibility to find out causal relationships by systematicexperiment (during the Renaissance).（西方科学的发展是以两项伟大成就为基础的：古希腊哲学家发明的形式逻辑体系（在欧几里德几何学）和（文艺复兴时期）发现通过系统性实验有可能找到因果关系。）”。

        应使用“these two steps”和“these two discoveries”来确指。

        因此，“those discoveries”和“those steps”不是指前文提到的“two great achievements（两项重大成就）”。从意思上来理解，“two great achievements（两项重大成就）只是方法和基础。尤其注意前文提到的是“the discovery of the possibility……”。