在Ruby中对数组进行循环时出现了问题

I'm a junior Ruby coder. I'm currently trying to figure out what's wrong with the code I'm writing. Basically, I have an array-of-arrays and I'm trying to loop through it and puts each array as a string. But no matter what I do, nothing works unless I do it long-hand, which I really don't want to do. To start off, here's my array:I'm a junior Ruby coder. I'm currently trying t