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词汇	bilateral symmetry
释义	bilateral symmetryn.（名词）bilateral symmetry Symmetrical arrangement, as of an organism or a body part, along a central axis, so that the body is divided into equivalent right and left halves by only one plane.两侧对称：沿一条中轴身体被一平面分为左右同等的两部分的对称排列，如有机体或身体部分
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