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Fatigue is
an uncomfortable feeling, it shows the weakening
of
activity
and
working
efficiency.
According
to
the
mechanism,
fatigue
can
be
classified
into
various kinds,
such as
physical
fatigue,
metal
fatigue, psychological fatigue,
etc.
Generally,
the
fatigue
that
can
be
relieved
after
a
rest
is
called physiological
fatigue
and that
cannot
be
relieved
after
a
rest
is
called
pathological fatigue, which may be an early symtom of
an illness
and
should
be
examined in
a
hospitalwhen
necessary.
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49
