but
used for introducing a word, phrase, or idea that is different to what has already been said

但是, 而

[连词]
even though
used to indicate that despite a certain fact or situation mentioned in the first clause, the second clause follows

即使, 尽管

[连词]
even if
used to introduce a hypothetical or conditional situation that contrasts with reality, implying that regardless of whether a certain condition is fulfilled or not, the outcome or action mentioned will still occur

即使, 即便

[连词]

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