( 1502524 )
↓
20 , . , .
" ": 1 - . ( ) 2 - . - 360 ... 6 - 7 - 8 - 9 - -. . 10 - 11 - " "
" ": 1 - . ( ) 2 - . - 360 ... 5 - 6 - 7 - 8 - 9 - -. . 10 - 11 - " "
- http://xyy1976.blog.163.com/blog/static/1623375120130149259589/