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本册书主要讲述四个孩子在邻居废弃的老屋中发现了一个秘密通道，到底是谁建立的秘密通道？这是用来干什么的？孩子们又在秘道里发现什么秘密呢？少年探险队是时候出发啦！每一次进入地道都是一场惊心动魄的体验，由于严重缺氧等问题，少年探险队们每一次都不能坚持太长时间，他们能够克服种种困难完成这一次冒险吗？
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