touchstone /ˈtʌtʃˌstəʊn/

• 1. 

  N-COUNT If you use one thing as a touchstone of another, you use it as a test or standard by which you judge the second thing. 试金石; 标准 [usu N 'of/for' n]

  例：

  Job security has become the touchstone of a good job for many employees.

  对许多雇员来说，工作的稳定性已经成了一份好工作的标准。