touchstone
(climatology) A plotted graph showing the relationships between precipitation and temperature.
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.
(biology) Having distinct male and female forms
(obsolete, anatomy) The wrist. / (palmistry) The lines or wrinkles running across the wrist at the base of the palm.
宝石商は販売する前に金の指輪の純度を確かめるために試金石を使った。
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