“底面”造句
袋子平整折起后，
底面與一側交疊。
When the bag is folded flat, the bag bottom overlaps one side of the bag.
也可能是為了使油漆有個適宜
底面.
Alternatively it may be solely a method of forming a suitable background for painting.
同高的平行六面體(的體積)之比等于其
底面(積)之比.
Parallele pipedal solids which are of the same height are to one another as their bases.