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{一|yī}/{二|èr}/{三|sān}{次|cì}{元|yuán}
{一|yī}/{二|èr}/{三|sān}{次|cì}{元|yuán}
一,二,三维 is used for objects/graphics as far as i know. 二维码 (2d number/code) means QR code for example. (in taiwan mandarin it's just called QRco' for some reason) and 一维码 can be used for a barcode but often another word is used.
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