Healthy facet joints support the spine while also allowing a wide range of twisting and bendingmotion.
健康的关节突关节在支撑脊柱的同时,允许作较大范围的扭转和弯曲。
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The modelers came up with tricks designed to increase flexibility, like the use of nested metal cups for characters' necks and spines to allow a wider range of motion without "bending" the metal.