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（单词翻译）
Cheap solar energy
Vocabulary
toxic
poisonous; able to cause illness or death
compound
a chemical that contains two or more elements
ensuing
happening as a result of
competitive
(of goods or services) as cheap or cheaper than
fossil fuel
source of energy formed from plants and animals which died millions of years ago (such as oil, coal and gas)
on an industrial scale
in large quantities
steadily
slowly but continuously
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