Englishfor English speakers
despite
Preposition
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If mathx/math happens despite mathy/math, it is surprising that mathx/math happens because mathy/math usually stops it.
Despite their best efforts, the ministers have not been able to come to an agreement.
Despite all the problems, I think this project is a success.
We hope that there will soon be changes despite the fact that the leaders are still the same old people.
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If you do something despite yourself, you didn't plan or want to do it.
She hated him, but when he spoke she laughed despite herself.
extensive
Adjective
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Extensive research, experience, damage, etc. is large in size, amount, or degree.
There has been extensive research into ways to improve schools.
She has extensive experience working with these computer systems.
After the wild fires, the damage was extensive.
investigation
Noun
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An investigation is a careful look at a crime, problem, etc. to find the truth or a solution.
Researchers were conducting further investigations into the connection between smoking and lung disease.
The cause of the fire is currently under investigation.