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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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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Many brought green ropes or strings, which they tied together to form a giant chain in Mousavi's signature color.

许多人带来了绿色的绳和线，捆绑在一起形成一个穆萨维签名颜色的巨大的链条。

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The makers of sugary breakfast cereals changed how they market to children, and the fast-food chicken dinner chain KFC stopped frying its food in artery-clogging,(high-trans-fat oils) after the group threatened to sue.

VOA: standard.2010.06.24

"Both this and the previous government made this 'chain of terror' argument where we have to be in Afghanistan to prevent al-Qaida moving from Pakistan back into Afghanistan because that may prevent future terrorist attacks on the streets of London.

VOA: standard.2010.08.04

But researchers think its origins lie further down the food chain - in plants, small mammals or insects.

BBC: News | Africa | Fighting back at ebola

Leading European and US retailers have come under growing pressure to ensure that workers in their supply chain - particularly in labour-intensive markets such as India and China - are not exploited.

BBC: Primark fires child worker firms

The short circuit resulted in a thermal runaway -- a chemical chain reaction -- in cell six, which spread to adjacent cells.

CNN: Boeing can conduct Dreamliner test flights