How to say "along, by, according to, on" in Russian?

По

"along, by, according to, on" is По in Russian.

По means "along, by, according to, on" in English.

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Word #27 of 4,000 by frequency in Russian — level A1.

Example

Он путешествует по разным странам каждый год.

He travels to different countries every year.