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Michelle Cha Posted 12 years ago
Grammar
Newly developed methods are challenging fossil fuels.
"Newly developed methods are challenging fossil fuels."
I don't understand the meaning of this sentence. - especially 'challenging'.
Please help me out.
I don't understand the meaning of this sentence. - especially 'challenging'.
Please help me out.
Top answer
New methods of using the fuels in more efficient ways—how efficiently can fossil fuels be used?
- New methods of using the fuels in more efficient ways—how efficiently can fossil fuels be used?
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1 Answers
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New methods of using the fuels in more efficient ways—how efficiently can fossil fuels be used?
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