Cách sử dụng
The word 'touchstone' is used to refer to something that serves as a standard or a test for evaluating the quality or worth of something else. It can also refer to a black stone used to test the purity of gold or silver by rubbing it on the stone, leaving a mark based on the metal's quality. For example, a writer might use a classic novel like Jane Austen's Pride and Prejudice as a touchstone for evaluating the quality of other romantic novels. Additionally, scientists might use a certain experiment as a touchstone for determining the validity of other research in the field.