The frame of an airship is made of light but strong metal.

飞船的框架是用轻而坚固的金属制成的。

《新英汉大辞典》

A strong, taut sheet, usually of canvas, attached with springs to a metal frame and used for gymnastic springing and tumbling.

蹦床一张通常由帆布制的结实坚韧的床布，和弹簧一起连接在金属框架上，用于体操跳跃及翻滚。

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