Ruby on rails 高效地将数组的数组转换为字符串数组

我有一个数组

arr=[["Sumit", "where"], ["where", "are"], ["are", "you"]]

我想改变信仰

arr=["Sumit where", "where are", "are you"]

我如何才能高效地完成这项工作

试试：

arr=[["Sumit", "where"], ["where", "are"], ["are", "you"]]
arr = arr.map {|i| i.join(' ') }

---

它给出[“Sumit”，“where”，“where”，“are”，“are”，“you”]但我想arr=[“Sumit where”，“where are”，“you]没有循环是否可能？

arr=[["Sumit", "where"], ["where", "are"], ["are", "you"]]  
v = arr.map { |x| x.join(" ") }  
p v