금이나 은의 순도를 판정하는 데 쓰이는 검은색의 단단한 돌.
A piece of fine-grained dark stone, such as schist or jasper, used to test the purity of gold or silver by the color of the streak left on it.
예문:
"The ancient goldsmith used a touchstone to verify the quality of the bullion."
"By rubbing the alloy against the touchstone, the merchant could estimate its gold content."
가치나 품질을 판단하는 기준이 되는 것.
A fundamental standard, criterion, or benchmark by which the quality or genuineness of something is judged.
예문:
"This classic novel remains the touchstone for all subsequent works in the gothic horror genre."
"Integrity is the touchstone of his leadership style."
"The success of the pilot program will be the touchstone for future investments."