touchstone [ˈtʌtʃstoʊn]

例句:

• A man's deed is the touchstone of his greatness or littleness.
  行动是一个人伟大或者渺小的试金石.
  
• the touchstone for quality
  检验质量的标准
  
• 42 As the touchstone tries gold, so gold tries man.
  42试金石试金, 黄金试人.
  
• Peter Gabriel provides the most obvious touchstone for Brewis here.
  来自BBC
• For Mr Tischhauser, the touchstone issue was global poverty.
  来自WSJ
• The trilling adverbs are a touchstone of Stewart's style.
  来自NEWYORKER