wenchao@kewinwang:~$ irb
irb(main):001:0> "你好"
=> "你好"
irb(main):002:0> exit
wenchao@kewinwang:~$ pry
[1] pry(main)> "������"
=> "\xE4\xBD\xA0\xE5\xA5\xBD"
[2] pry(main)>