late 15c., from touch (v.) in the Middle English sense "to test" (metal) + stone (n.). Fine-grained black quartz, used for testing the quality of gold and silver alloys by the color of the streak made by rubbing them on it. Also see basalt. Figurative sense is from 1530s.
实用例句
1. the touchstone for quality
检验质量的标准来自《权威词典》
2. 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.来自《简明英汉词典》
3. 42 As the touchstone tries gold, so gold tries man.
42试金石试金, 黄金试人.来自英汉非文学 - 民俗
4. Job security has become the touchstone of a good job for many employees.
工作稳定性已成为很多员工衡量一份工作好坏的标准。来自辞典例句
5. The touchstone of a contract is the notion of equality.
