成對的東西
Duad \Du"ad\, n. [See {Dyad}.] A union of two; duality. [R.] --Harris.
duad n : two items of the same kind [syn: {couple}, {pair}, {twosome}, {twain}, {brace}, {span}, {yoke}, {couplet}, {distich}, {duo}, {duet}, {dyad}]
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