No. 9,981 in Russian

антивирусом

"Антивирусом" means "antivirus" (software that protects against computer viruses).

In a sentence

Я установил антивирусом на свой компьютер.
I installed antivirus software on my computer.
The word 'антивирусом' is used here as an object, indicating the software being installed.
Мы защитили систему антивирусом.
We protected the system with antivirus software.
Here, 'антивирусом' functions instrumentally, describing the tool used for protection.
Работа с антивирусом помогает предотвращать угрозы.
Working with antivirus software helps prevent threats.
In this instance, 'антивирусом' refers to the software being handled or used in action.

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