Pentagon
noun
noun
ˈpentəɡən
noun
1
the Pentagon
the
building
in
Washington
DC
from
which
the
US
army,
navy
etc
are
controlled,
or
the
military
officers
who
work
in
this
building
五角大楼，美国国防部
penˈtæɡənəl
noun
2
a
flat
shape
with
five
sides
and
five
angles
五边形，五角形