Roughly, they mean 'but' or 'however' or 'on second thought'.
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aleileiAs a non-native English speaker, I really wanna improve my oral languageI know this is not what you asked about, but may I suggest that if you want to improve your English you get rid of "wanna"? At the very least, reserve it for casual conversation -- in my opinion, it should never appear in written English except in quoting what someone has a