幅射龟雄龟的平均背甲（Carapace）长度是 33.4 公分（介于 28.5-39.5 公分）， 幅射龟母龟的平均背甲长度是 30.5 公分（介于 24.2-35.5 公分）。
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Spikd Carapace 镜象术
Spiked Carapace 尖刺外壳 ; 带刺外壳 ; 倒刺甲壳 ; 刺盾
Pneumatized Carapace 气化甲壳
Creature Carapace 生物甲壳
ice carapace 冰盖 ; 冰帽
Knightbane Carapace 骑士灾厄甲胄
N-COUNT A carapace is the protective shell on the back of some animals such as tortoises or crabs. (龟、蟹等的)甲壳 [正式]
N-COUNT You can refer to an attitude that someone has in order to protect themselves as their carapace. 保护壳 [文学性] [usu with supp]
The arrogance became his protective carapace.
傲慢成了他的保护壳。
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