rectangle 长方形
Each rectangle in this PowerPoint represents one step in the process.
幻灯片里的每一个长方形都代表了整个过程的一个步骤。
oval 椭圆形
Eggs are typically oval.
鸡蛋是典型的椭圆形。
cube 立方体
The Beijing National Aquatics Center, or the Water Cube, was built in preparation for the 2008 Olympics.
北京国家游泳中心，或者说水立方，是为了2008年北京奥运会建造的。
pyramid 金字塔
How these pyramids were built remains a mystery to the world.
这些金字塔究竟是如何建造的仍然是一个巨大的谜团。
