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biology 生物 a hard outer layer that protects the bodies of certain animals, such as insects （昆虫等动物的）外骨骼 a machine attached to somebody's body to enable them to perform movements and actions more easily Robotic exoskeletons add strength to healthy limbs and restore movement to weak ones. 机器人的外骨骼为健康的四肢增加力量，并使四肢恢复运动。