名词
中文翻译：外壳
同义词：
['casing', 'shell', 'elevator spider']
例句：
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1.The robot's casing is made of a lightweight material.
这个机器人的外壳是用轻质材料制成的。
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2. The elevator spider is responsible for monitoring the elevator's performance.
电梯蜘蛛负责监控电梯的性能。
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3.The casing was designed to protect the device from damage.
外壳的设计是为了保护设备免受损坏。