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A man walks past a poster during the 24th International Oil, Gas, Refining & Petrochemical Exhibition in Tehran, Iran, on May 1, 2019. (Xinhua/Ahmad Halabisaz)
A man walks past a poster during the 24th International Oil, Gas, Refining & Petrochemical Exhibition in Tehran, Iran, on May 1, 2019. (Xinhua/Ahmad Halabisaz)