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на первом

on the first; in first place

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phrase Rare #43,677
on the first; in first place Often used before a masculine noun, or on its own when the noun is clear from context. It can also mean being in first place in a competition.
RU: На первом этаже живёт моя сестра.
EN: My sister lives on the first floor.

На первом собрании было тридцать человек.

There were thirty people at the first meeting.

На первом круге.

On the first lap.

— Сенна (2010)

Теперь мы на первом!

Now we're in first place!

— Три идиота (2009)

Потом садитесь в трамвай, который стоит на первом пути.

Then get on the tram waiting on the first track.

— Невидимый гость (2017)