"双数"是个多义词，它可以指双数（理学）,双数（朱七演唱歌曲）。
瓜依沃语中不光有单数和复数，还有双数和若干的概念。
And Kwaio has not just singular and plural, but dual and paucal too.
春联通常是成对张贴，因为双数在中国文化中是好运气和吉利的象征。
New Year couplets are usually posted in pairs as even Numbers are associated with good luck and auspiciousness in Chinese culture.
古希腊语中有双数形式，但在现代希腊语中已同复数形式合并在一起了。
Ancient Greek had the dual form but it has merged with the plural form in modern Greek.
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