Σacademic Lily

A relaxing and wonderful story about a former revolutionary who has nothing to do with revolution. There is a portable space and a companion. Xiaobai quickly writes about it. The main body has been completed, and the side stories are being updated! Σ ['Sigma] 1. The eighteenth letter of the Greek alphabet. 2.[Number] and formula number. If there are n values x1, x2, ..., Xn, then the sum of these n values is: Σ = x1 + x2 + ... + Xn ——Excerpted from "Encyclopedia of Endless Learning", the only version of Babel Library. Zhao Choucheng's column, please support me and collect it, please click me! Other works: "Beauty Bottle", "Jingluo Artist Copy", "Pillow Love", "Shen Qingqing's Announcement of Engagement" [Announcement] This article has been published as a V on January 28, and all reprints will be declined starting from Chapter 38. Friends who have reposted it please delete or withdraw it immediately. Thank you for your support! #Favorite_1{color:#FF0000; font-weight: bold;} Intention: