もう少しゆっくり話していただけますか?
Mou sukoshi yukkuri hanashite itadakemasu ka?
Polite — works with strangers.
A safe, polite request when you miss something in conversation. Slightly more natural than asking for it「もう一度」(again).
もう少しゆっくり話していただけますか?
Mou sukoshi yukkuri hanashite itadakemasu ka?
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