No. 4,069 in Russian
нефтехимика
The Russian word "нефтехимика" means "petrochemist" in English, referring to a specialist in petrochemistry.
In a sentence
Нефтехимика пригласили на конференцию, где он выступил с докладом.
The petrochemist was invited to the conference, where he delivered a report.
In this context, 'нефтехимика' ('petrochemist') is used in the accusative case as the direct object of the verb 'пригласили' ('invited').
Опыт нефтехимика помог в разработке нового топлива.
The petrochemist's experience helped in the development of new fuel.
Here, 'нефтехимика' ('petrochemist') is in the genitive case indicating possession, referring to the experience belonging to the petrochemist.
Мы работали с нефтехимиком над проектом по улучшению продукции.
We worked with the petrochemist on a project to improve production.
In this example, 'нефтехимиком' ('petrochemist') is in the instrumental case showing the means or accompaniment by which the action was performed.
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