[android-beginners] R.styleable cannot resolved in Eclipse with ADT

Hello everyone!
Today  when I develop a app with ADT
Eclipse tells me R.styleable cannot resolved
The class menu shown after 'R' doesn't have 'styleable'
who can tell me how to solve the problem
Thanks a lot

My OS is windows XP  SP3
The Eclipse version is 3.5.0
Maybe I have something wrong with path system variables?
Wish for your reply  :-)

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