The author has established the mechanical model of O-chain iron and U-chain iron respectively, obtained the computing formula of load and stress, and contrasted with example.

本文分别建立了O形环与U形环的力学模型，推导出了载荷、应力分布的计算公式，并引用实例进行了对比分析。

youdao

youdao

In Sichuan, soldiers spent a hard time creeping across Luding Chain Bridge, which was made up of 13 iron chains, in the middle of gun fire.

在四川，士兵们在炮火中艰难地爬过由13条铁链组成的泸定铁桥。

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The rusty iron chain that double-locked the cart to the front wheels of the cycle began to squeal as he rode.

NEWYORKER: The Elephant

The fundamental model we teach MBAs for thinking about manufacturing is the value chain, a simple model that describes the value adding steps that take a low value material like iron ore and turn it into a high value product like a Ferrari Testarossa.

FORBES: Sustainable Consumption Rising on the Business Agenda