但和一些城市探险者不同的是，他们不是单纯为了追求危险而置身险境。
But unlike some urban explorers, they do not court danger purely for its own sake.
当探险者在月球登陆时，他们发现月球上布满地下城市。
When the explorers landed on the moon, they discovered that the moon was full of underground cities.
当探险者在月球登陆时，他们发现月球上布满地下城市。
When the explorers landed on the moon, they discovered that the moon was full of underground cities.
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