pentagonn.五边形Pentagon:五角大楼（美国国防部）.pentagonal capsomer五面体壳粒pentagonaltimbering五边形支撑pentagonal bipyramid五角双锥pentagonal timbering五边形支撑pentagonpyramid flap五角锥形皮瓣pentagonal prism finder五梭镜取景器Pentagon Liaison Office五角大楼联络处pentagonal dodecahedron五角十二面体Pentagon-commissionedadj.五角大楼委托的pentagonal dodecahedrane五角十二面烷