例句與造句

1. There are many different polygon partition problems, depending on the type of polygon being partitioned and on the types of units allowed in the partition.
2. In a packing problem, in which the units must be disjoint and their union may be smaller than the target polygon, and to a polygon partition problem, in which the units must be disjoint " and " their union must be equal to the target polygon.
3. It's difficult to find polygon partition in a sentence. 用polygon partition造句挺難的