样品目录2
`-- 样本目录
|-- admin
|-- cambridge
| `-- security
| |-- annex
| `-- parking
|-- history.exe
|-- markham
| |-- annex
| |-- building1
| `-- parking
`-- stenton
|-- gen_ed
`-- lib_arts
`-- english.txt
~ 不是 sample_dir2 而是 sample_dir 所在的目录