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With difficulty he released the mattress from the metal frame, and groped beneath it.

他费了很大劲把床垫从金属架上卸下来，然后在下面摸索一番。

《柯林斯英汉双解大词典》

The procedure involves an artificial aortic valve, made from pieces of a cow's valve sewn to a metal frame.

该过程涉及到使用一只人工制作的主动脉瓣，它是由一个缝在金属框架里的牛的脉瓣制成的。

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A hoop house is basically a metal frame covered with plastic or other all-weather material.

VOA: special.2009.12.22

His father, Ravi Pazhani, a slight man with metal-frame glasses, sat behind him.

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The original Zeppelins were based on a rigid design in which separate gas-tight compartments were surrounded by a metal frame covered with a non-airtight fabric.

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And added a Metal Works-special top frame with duplex-style front bars.

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