Cov
abbr. 恶棍城市（游戏名, City of Villains）；反障碍车辆（Counter-Obstacle Vehicle）；变异系数（Coefficient of Variation）
🗣️ 情景例句
They don't ask how much someone paid for something.
他们不问别人买某个东西要花多少钱。
They had to cut down a lot of trees to make room for farms.
他们为了为农场增加空间不得不砍倒很多树。
To know everything is to know nothing.
样样通，样样松。