Symmetry



GRE 蓝宝 Barron TOEFL 考研

解释

GRE 红宝书

• n.对称; 均衡
• ［英］ n.对称;均衡 ( balanced proportions)
• ［类］ 反义词: disproportion ( 不对称)
• ［记］ sym ( 共同) +metry ( 测量) -> 两边测量相同 -> 对称
• ［同］ 派生词: symmetrical ( adj.对称的)

Webster Collegiate

noun (plural -tries)

• Etymology: Latin symmetria, from Greek, from symmetros symmetrical, from syn- + metron measure — more at measure
• Date: 1563
• 1. balanced proportions; also beauty of form arising from balanced proportions
• 2. the property of being symmetrical; especially correspondence in size, shape, and relative position of parts on opposite sides of a dividing line or median plane or about a center or axis — compare bilateral symmetry, radial symmetry
• 3. a rigid motion of a geometric figure that determines a one-to-one mapping onto itself
• 4. the property of remaining invariant under certain changes (as of orientation in space, of the sign of the electric charge, of parity, or of the direction of time flow) — used of physical phenomena and of equations describing them

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