元となった辞書の項目
counterweight
noun
A
heavy
mass
of
often
iron
or
concrete,
mechanically
linked
in
opposition
to
a
load
which
is
to
be
raised
and
lowered,
with
the
intent
of
reducing
the
amount
of
work
which
must
be
done
to
effect
the
raising
and
lowering.
Counterweights
are
used,
for
example,
in
cable-hauled
elevators
and
some
kinds
of
movable
bridges
(e.g.
a
bascule
bridge).
意味（1）
A
heavy
mass
of
often
iron
or
concrete,
mechanically
linked
in
opposition
to
a
load
which
is
to
be
raised
and
lowered,
with
the
intent
of
reducing
the
amount
of
work
which
must
be
done
to
effect
the
raising
and
lowering.
Counterweights
are
used,
for
example,
in
cable-hauled
elevators
and
some
kinds
of
movable
bridges
(e.g.
a
bascule
bridge).
