发布于:2025-07-06 05:28浏览量:66文/优校网
1.希腊字母表的第十八字母 【动,植】 S [Σ] 形;【心】千分之一秒
1.the 18th letter of the Greek alphabet, represented in the English alphabet as 's'
2.the symbol (σ) indicating the addition of the numbers or quantities indicated