isochron
isochron[ˈʌɪsə(ʊ)krɒn]noun- (chiefly Geology)a line on a diagram or map connecting points relating to the same time or equal times
(主地质)等时线
语源- late 17th cent. (as an adjective in the sense 'isochronous'): from Greek isokhronos, from isos 'equal' + khronos 'time'
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