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）。
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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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Radial symmetry the arrangement of parts in an organism in such a way that cutting in any plane across the diameter splits the structure into similar halves (mirror images).