单词：sigma
音标：['si^mә] ；
[计] 求和
[医] σ(希腊文第十八个字母)
[医] σ(希腊文第十八个字母)
n. the 18th letter of the Greek alphabet
词型变化：名词复数形式 : sigmas
词性分布：
sigma的用法和样例：
例句
用作名词(n.)
- Summations are almost invariably indicated ellipses instead of the more prevalent sigma notation.在表示“连加”的式子中，几乎一成不变地使用省略号来代替更为流行的“∑”符号。
词汇搭配
- sigma particle∑粒子
- sigma phase西格玛相,相...
- sigma factor务马因子,西格玛因子...
- delta sigma modulation增量总和调制...
- sigma reaction西格马反应
- sigma storage求和存储器
- sigma hardness tester西格马测试硬度计...
- three-sigma limit[计] 三界限
- sigma memory求和存储器
- sigma formation形成相
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