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？

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The slump on Wall Street set up a chain reaction in stock markets around the world.

华尔街股价暴跌在全球股票市场上引起了连锁反应。

《牛津词典》

They break up nature's food supply chain.

它们破坏了大自然的食物供应链。

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To represent that chain of events, a long line of oversized, brightly painted dominoes has been set up running for one-and-a-half kilometers in an area where the Wall once stood.

VOA: standard.2009.11.09

The other chain is facing in the other direction, the 3' carbon is up, the 5' carbon is down.

对面的那条单链方向相反,3'位的碳原子向上,5'位的碳原子向下

耶鲁公开课 - 生物医学工程探索课程节选

They're colored different here to indicate one new difference that you know about now, and that's that there is an orientation, there's an up and down on the chain.

这里被涂成不同的颜色,来表示另一个不同之处,它是有方向的,表示双链一条向上,一条向下

耶鲁公开课 - 生物医学工程探索课程节选

Plus, with dual Thunderbolt ports, the user can daisy chain up to six Thunderbolt peripherals together.

ENGADGET: LaCie announces the 5big Thunderbolt series: up to 20TB capacity starting at $1,199

It offers simultaneous bi-directional 10Gbps transfer speeds over a single cable, with the flexibility to daisy-chain up to six Thunderbolt-ready devices with a single connection as well as offering full display port support for a 7th Thunderbolt or display port equipped monitor.

ENGADGET: ASUS and MSI launch Thunderbolt motherboards, tie for first place

The designs ceased to be novel, the excitement wore off and the chain ended up with a sluggish pile of inventory.

FORBES: Fashion statement