noun
a word that represents a person, place, thing, or idea
adjective
a word that describes or modifies a noun or pronoun
preposition
a word that shows the relationship between a noun or pronoun and other words in a sentence
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The country's cybersecurity systems are under attack by sophisticated hackers.
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Our website is under attack by spammers trying to post fake comments.
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Our neighborhood is under attack by a gang of troublemakers.
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His reputation is under attack from false rumors spread by jealous competitors.