他建造了地下秘密通道和他的湖上秘密居所。
He built secret passages underground, and his secret house on the lake.
他的侄子阿克塞尔最终找到了这些文字的秘密，原来是一条通向地心的秘密地下通道。
His nephew, Axel, finally discovers the writing's secret, which tells of a hidden underground pathway leading to the center of the earth.
他的侄子阿克塞尔最终找到了这些文字的秘密，原来是一条通向地心的秘密地下通道。
His nephew, Axel, finally discovers the writing's secret, which tells of a hidden underground pathway leading to the center of the earth.
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