同时迭代两个字符串

I am just wondering if there is any beautiful way to iterate over two strings at the same time:

var ascii_runes = []rune(string_1)
var shifted_runes = []rune(string_2)

for i := 0; i < len(string_1); i++ {
    fmt.Println(string(ascii_runes[i]) + string(shifted_runes[i]))
}

Not sure IIUC, but for example:

package main

import (
        "fmt"
)

var (
        ascii   = []rune("string1")
        shifted = []rune("STRING!")
)

func main() {
        for i, v := range ascii {
                fmt.Printf("%c%c
", v, shifted[i])
        }
}

Also here: http://play.golang.org/p/2ruvLFg_qe

Output:

sS
tT
rR
iI
nN
gG
1!

For example,

package main

import "fmt"

func main() {
    var runes_1, runes_2 = []rune("string_1"), []rune("string_2")
    for i := 0; i < len(runes_1) && i < len(runes_2); i++ {
        fmt.Println(string(runes_1[i]) + string(runes_2[i]))
    }
}

Output:

ss
tt
rr
ii
nn
gg
__
12