  We report on a systematic investigation of the Hbeta and Fe II emission lines
in a sample of 568 quasars within z < 0.8 selected from the Sloan Digital Sky
Survey. The conventional broad Hbeta emission line can be decomposed into two
components--one with intermediate velocity width and another with very broad
width. The velocity shift and equivalent width of the intermediate-width
component do not correlate with those of the very broad component of Hbeta, but
its velocity shift and width do resemble Fe II. Moreover, the width of the very
broad component is roughly 2.5 times that of the intermediate-width component.
These characteristics strongly suggest the existence of an intermediate-line
region, whose kinematics seem to be dominated by infall, located at the outer
portion of the broad-line region.
