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touchstone

['tʌʧstəun] 名词
一般 Probierstein m; Prüfstein m; Maßstab Qualität
冶金 Basanit m
技术 schwarzer Kieselschiefer
矿业 Lydit m; Lydischer Stein
touchstones 名词
一般 Probiersteine m; Prüfsteine m
 英语 词库
touchstone ['tʌʧstəun] 名词
一般 (A.Rezvov); a fundamental or quintessential part or feature : basis (merriam-webster.com A.Rezvov); a test or criterion for determining the quality or genuineness of a thing (merriam-webster.com A.Rezvov); a black siliceous stone related to flint that is used to test the purity of gold and formerly silver by the streak left on the stone when rubbed by the metal (merriam-webster.com A.Rezvov)