The opened link is used to join the two ends of the chain.

这个开口环是用来连接链条两头的。

《柯林斯英汉双解大词典》

The chain isn't for you.

那链子不是给你的。

youdao

The chain of supermarkets lost money.

连锁超市赔钱了。

youdao

In two thousand one, genetically modified corn made by Syngenta was found in the food supply chain without approval.

VOA: special.2011.03.08

That is, the chain, they could they could be approached with very little change from the equilibrium state.

这些态可以,通过平衡态,发生一些微小的变化得到。

麻省理工公开课 - 热力学与动力学课程节选

This blue chain here goes from 5' carbon all along the chain and there's a 3' carbon left open at the bottom.

这条蓝色的链,从5'碳开始一直向下延伸,以3'碳做为链的末端

耶鲁公开课 - 生物医学工程探索课程节选

This fall the chain has opened outlets of upscale cosmetics purveyor Sephora in its stores.

FORBES: Merely Cosmetic

Cyberdefense, after all, is only as effective as the weakest link in the chain.

WSJ: Anders Fogh Rasmussen: NATO's Next War��in Cyberspace

Most women are reporting to men, and that increases as we advance up the chain.

FORBES: Why Men Hate To Give Women Feedback