物体的表面—平面图形的大小，叫做它们的面积（表示二维平面图形的大小）

　　使定义语能真实揭示事物的本质属性，更合乎逻辑，因为“面”是“有长有宽没有高”的一种“形迹”，而这种形迹并不一定要是“平面”的。 -Surface of the object- the size of a plane figure, called their area (two-dimensional graphical representation of the size of) the definition of words can truly reveal the essential nature of things, more logical, because the " face"　is " no longer has a wide high"　a kind of " acting"　and this trail may not necessarily be " flat"　in.