How to glob variables in bash script?

dirs=/content/{dev01,dev02}
ls -l $dirs

+ dirs=/content/{dev01,dev01}
+ ls -l '/content/{dev01,dev01}'
ls: /content/{dev01,dev01}: No such file or directory

eval ls $dirs

dirs=/content/{dev01,dev02}*

dirs=(/content/{dev01,dev01})

#!/bin/sh
dirs=`echo ./{dev01,dev02}`
ls $dirs

ls `echo $dirs`