1. duo [jia;jiao;jue] xing   ellipse   quadrangle   plane   polygon   Hint Half-n-half Clue   2. chui zhi xian   rhombus   perpendicular lines   pentagon   hexagon   Half-n-half Clue   3. [leng;leng;ling] jing   prism   rhombus   vertex   pyramid   Half-n-half Clue   4. si fang xing   edge   straight line   ray   quadrilateral   Half-n-half Clue   5. [ao;wa] mian   concave   heptagon   edge   rhombus   Half-n-half Clue   6. ling xing   rhombus   straight line   convex   ellipse   Half-n-half Clue   7. qi [bian;bian] xing   polygon   prism   quadrilateral   heptagon   Half-n-half Clue