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Coal and natural gas are mainly used for electricity generation, whereas oil is used mostly to power transportation, yet the prices of all these energy sources are linked.

煤炭和天然气主要用于发电，而石油主要用于给运输提供能量，但所有这些能源的价格是相互关联的。

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Originally, soap was not mainly used for cleaning.

最初，肥皂并不主要用于清洁。

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Adam Ingram told MPs that they "will be mainly used for training and evaluation".

BBC: Minister fuels Eurofighter uncertainty

Once Sherlock was mainly used for cataloging and searching the contents of your hard drive.

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It was built in 1945 and was mainly used for training.

BBC: Battle of Britain Memorial Flight unveils new Spitfire