ectangle(长方形):
books,boxes,windows,desks,doors,blackboards,televisions,DVDs,cards,rulers,papers
triangle(三角形):sandwiches,sushi,biscuits
square(正方形):tables,screens,carpet,ceramic tiles
oval(椭圆):face,cakes,beans,rubbers
trapezium(梯形):bridges,buckets
用英文分别举3例写出5种形状的物品,每种举3个例.比如 circle：mirrors,clocks,coins sphe