Englishfor English speakers
conclusion
Noun
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A writer or speaker's conclusions are the ideas that they have after thinking about all the important information.
The study's main conclusion is that more money will not solve the problem.
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The conclusion is the end.
At the conclusion of the story, we still don't know why he did it.
of
Preposition
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Made using.
It is a house of cards.
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.