at sixes and sevens
乱七八糟
on second thoughts
再三考虑
by ones and twos
两两地，零零落落地
Two heads are better than one.
三个臭皮匠胜过诸葛亮。
Can you come down a little? --Sorry, it's one price for all。
你能便宜一点卖吗？对不起，不二价。
He had one over the eight after be drank only half bottle of the wine。
他才喝了半瓶酒就醉得七歪八倒了。