cubics

例句：

1. 1. The cube is a simple shape that can be used to represent many different objects.
   立方体是一种简单的形状，可以用来代表许多不同的物体。
2. 2.The polyhedron is a three-dimensional shape that has six faces and six edges.
   多面体是一种三维形状，有六个面和六条边。
3. 3.The cube has six sides, each side measuring one unit of length.
   立方体的每条边长为一单位长度。