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Sigma - Wikipedia, the free encyclopedia
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日期:2026-04-23
Sigma (upper-case Σ, lower-case σ, lower-case in word-final position ς; Greek σίγμα) is the eighteenth letter of the Greek alphabet, and carries the 's' sound. In the system of Greek numerals, it has a value of 200. When used at the end of a word, when th...看更多

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