The attic is a prime source for heat and cold air exchange.

阁楼是冷热空气交换的源头。

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Issues surrounding the cold chain were another source of problems.

冷链方面的问题属于另外一个问题根源。

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While coffee is the main source of caffeine for many people, it's also found in energy drinks, soft drinks, tea, chocolate, and over-the-counter cold and headache medicines.

对于很多人来说咖啡是咖啡因的主要来源，但它同时存在于功能饮料、软饮料、茶、巧克力，和非处方的感冒和头痛药中。

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Europe's food retailers depend on a complex network of brokers, cold stores and meat-cutting plants around the continent from which to source the ingredients wherever they are cheapest, says the BBC's Christian Fraser, in Paris.

BBC: Horsemeat found in Ikea meatballs in Czech Republic