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what does it mean
Recently, I read a article, and one sentence i dont understand. "but the main reason is that natural gas is replacing coal everywhere as an energy source ,and gas emits half as much carbon dioxide as coal. ". In the sentence, what does "...and gas emits half as much carbon dioxide as coal" mean？gas emission =0.5 carbon emission=0.5 coal emission?
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what does it mean
when I check the dictionary about plague, I do not understand its sentence means. "drops in population levels due to plagues. what does the sentences "drops in population levels " means, thanks.
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Any sentence wrong？
"I will trim my hair after class" ,or "I will trim my hair after finishing class", which one is better? thanks
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