radar
noun
ˈreɪdɑː
noun
1
a
piece
of
equipment
that
uses
radio
waves
to
find
the
position
of
things
and
watch
their
movement
雷达;
The
coastline
can
now
be
monitored
by
radar.
现在海岸线能用雷达监测。
We
could
see
the
plane
quite
clearly
on
the
radar
screen.
在雷达屏幕上可清晰地看见飞机。