数字习语：at sixes and sevens
at sixes and sevens 为习语，意为：乱七八糟，七上八下，杂乱无章，一片混乱。如：
■The boy made the room at sixes and sevens. 这男孩把房间弄得乱七八糟的。
■I haven’t had time to arrange everything so I’m all at sixes and sevens. 我没来得及把每件事都安排好，因此心里七上八下的。
■They held a party last night and everything was at sixes and sevens when the guests left. 昨晚他们开了一个家庭聚会。当客人散尽之后，一切物品都挪了位置。
■After the captain of the team broke his leg, the other players were at sixes and sevens. 球队队长摔断了腿，其他队员陷入了一片混乱。
■The members couldn't come to an agreement. They were at sixes and sevens. 委员们不能达成一致意见，他们各持己见。