  We consider a braneworld model in the scalar-tensor gravity. In order to
solve the gauge hierarchy problem in this model, our world should be confined
on the positive tension brane rather than on the negative one. This is crucial
to reproduce a correct Friedmann-like equation on the brane. Interestingly, it
is found that the spacing of mass spectrum in this scenario is very tiny, but
the light gravitons cannot be observed individually in colliders because of
their sufficiently weak interaction with matter fields on the visible brane.
