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    dòng

    dòng

    1. cave; hole
    2. zero (unambiguous spoken form when spelling out numbers)

    山里有一个很大的洞。 Shān lǐ yǒu yī ge hěn dà de dòng.

    tóng

    1. used in 洪洞[Hong2 tong2] (the name of a place in Shanxi)