Usages of dōu
他 和 她 都 很 高兴。tā hé tā dōu hěn gāoxìng.
He and she are both very happy.
他 和 她 都 喜欢 看 书。tā hé tā dōu xǐhuan kàn shū.
He and she both like to read books.
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