n .
a standard ; a test of authenticity or quality 표준, 시금석 ; 진위여부나 품질에 대한 테스트

• In its original usage, a _____ was a dark stone against which gold and other precious metals were rubbed in order to test their purity. Now the word is used more loosely to describe a broad range of standards and tests.
• The size of a student's vocabulary is a useful _____ for judging the quality of his or her education.
• A candidate's pronouncement about the economy provided a _____ by which his or her fitness for office could be judged.
  경제에 관한 후보자의 의견은 그가 직무에 적합한 사람인가를 판단할 수 있는 기준을 제시해 주었다.