Teachers, save “Math 8.3 Symmetry 对称” to assign it to your class.

Symmetry (or line symmetry) means that half of an image is the mirror image of the other half (Ex. butterfly wings). Today we are going to look at some examples where we see symmetry in nature. You do not need to send your teacher your work today. Try to find the line of symmetry in each photo. 对称（或轴对称）表示图像的一半是另一半的镜像（例如：蝴蝶翅膀）。今天，我们将看一些自然界中对称的例子。你今天不用给老师发作品，尝试在每张照片中找出对称线。