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1. 然而，人们对咖啡因的敏感度可能差别很大。

   rán'ér, rén​men duì kā​fēi​yīn de mǐn​gǎn​dù kě​néng chā​bié hěn dà.

   However, people's sensitivity to caffeine can vary greatly.

   Source: CCMatrix