频率多边形比直方图更简单.The frequency polygon is simpler than its histogram counterpart.这个多边形的周长是多少?What is the perimeter of this polygon?只能为任意多边形对象访问此成员.This member can only be accessed for a freeform object....
酷爱假日的英国人正收拾小桶和锹铲前往阳光充足的地方。Holiday mad Brits are packing their buckets and spades and heading for the sun.女孩们带着铲子和小桶在沙滩上快活地玩耍。The girls happily played in the sand and sea with buckets and spades.那小桶啤酒给喝光了.The keg of beer ...