如何~%在列表中的每三个参数后添加回车符(使用)？
我现在有:
(format nil "~{~a ~}" (list '"one" '"two" '"three" '"four" '"five" '"six" '"seven" '"eight" '"nine" '"ten"))
;=> "one two three four five six seven eight nine ten "
但我想:
;=> "one two three
; four five six
; seven eight nine
; ten "