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。

youdao

But why did they use iron chains to chain up the pillars?

可是为什么要用铁链把这些柱子拴起来啊？

youdao

At night, the gates were shut, the river was barred at both ends of the city with huge iron chains, and Paris slept tranquilly.

夜里各城门紧闭，全城两端用几根粗大铁链拦住沟面，巴黎便可安然睡觉了。

youdao