Bilateral symmetry The arrangement of parts in fan organism in such a way that the structure can only be divided into similar halves (mirror images) along one plane.
左右对称：通过中央轴，只有一个对称面将生物体分成左右相等的两部分（镜像）。
Reflection symmetry is also known as bilateral symmetry. It is the "mirror" effect or when one object is reflected across a plane to create another instance of itself.
反射对称也叫做左右对称。反射对称就是一种镜子效映，忆■物体在平面内反射后得到另忆■自已。
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