English Dictionary

touchstone

/ˈtʌt͡ʃstəʊn/

noun

A stone used to check the quality of gold alloys by rubbing them to leave a visible trace. / (figuratively, by extension) A standard of comparison or evaluation.

The touchstone of a good friendship is trust.

意味（1）

A stone used to check the quality of gold alloys by rubbing them to leave a visible trace.

意味（2）

(figuratively, by extension) A standard of comparison or evaluation.

The foregoing doctrine affords us also a touchstone for the trial of spirits.