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Explanation: Actually, I think it would sound better in English to say "in the first discussions" even if it has only been one time, because one assumes that more than one person has discussed this issue during the 'discussion'. Here are some references from Eurodicautom:
Spanish Term debate
English Term Discussion (which takes place within a meeting)
Spanish Term debate parlamentario
English Term parliamentary debate
Laura Hastings Local time: 03:49 Native speaker of: English, Spanish PRO pts in pair: 32