ruler
noun
ˈruːlə
noun
1
someone
such
as
a
king
or
queen
who
has
official
power
over
a
country
or
area
统治者
2
a
long
flat
straight
piece
of
plastic,
metal,
or
wood
that
you
use
for
measuring
things
or
drawing
straight
lines
尺子，直尺
a
12-inch
ruler
一把 12 英寸的尺子