Sharks are at the top of the food chain in the ocean's ecosystem.

在海洋生态系统中，鲨鱼处于食物链的顶端。

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I remembered learning about the food chain in the 7th grade.

我记得在七年级时学过有关食物链的知识。

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Even essential medicines expire in the supply chain in Uganda.

甚至是乌干达药品供应链内的基本药品都已经过期。

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

VOA: special.2011.03.08

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

The other tip I'm going to give you is any time you see a chain molecule, by chain I just mean many different atoms written out in a row.

我要告诉大家的另外一个小窍门是,每当你看到一个链状分子，链状的意思是说很多,不同的原子写成一行的形式。

麻省理工公开课 - 化学原理课程节选

Uniqlo, under the leadership of CEO Tadashi Yanai, is now the largest apparel chain in Asia.

FORBES: Is There Room In America For H&M And Uniqlo?

They will conduct assessments in the rest of their supply chain in upcoming years.

FORBES: Mars, Nestl�� Commit To Better Chocolate, For All

We are not convinced that all areas of the transportation chain in the world are ready.

BBC: Airline to give Y2K update