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HSK levels

    国书 國書

    guóshū

    1. credentials (of a diplomat); documents exchanged between nations
    2. national or dynastic history book

    大使带着国书前往首都进行外交活动。 dàshǐ dàizhe guóshū qiánwǎng shǒudū jìnxíng wàijiāo huódòng.