• The Big Bear Observatory is located in a clear mountain lake which is known for its atmospheric stability.

    大熊天文台坐落一个清澈湖中,那里气流平稳闻名

    youdao

  • The Big Bear Observatory is located in a clear mountain lake which is known for its atmospheric stability.

    大熊天文台坐落一个清澈湖中,那里气流平稳闻名

    youdao

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