why i cant see the directory

in some ftp site,why i cant see some directorys which exactly exits,when i get the directory's name then use
cd name,i can get into that directory.
how can i see those hidden directorys?
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jftaoAsked:
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dhughes111797Commented:
Some sites have setup hidden directories so that you must read
a README type file to know what the directory name is, or you
must know before-hand the name of the directory. This is often
used to sensitive information or information which is
of a restricted nature (things which cannot be exported out of
the country is an example). This is done by turing the read bit
of the directory off while leading the execute bit on using chmod.
dir. You can type 'dir' at the prompt to see the file permissions.
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