but beneath these rolling desert slopes in the United States 但是在美国这些荒凉起伏的山崖之下

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  1. but cave explorers were soon to make an even more astonishing discovery.
    但是洞穴探险家们 很快又有了更惊人的发现
  2. Beneath this arid landscape lies a subterranean wonderland.
    谁能想到在这些贫瘠的土地下 有一处地下仙境
  3. Without water one might not expect to find any caves,
    没有水的地方似乎不可能有洞穴
  4. but beneath these rolling desert slopes in the United States
    但是在美国这些荒凉起伏的山崖之下
  5. lies one of the longest, deepest and most surprising caves in the world.
    存在着一座世界上最长、最深 也最令人惊奇的洞穴
  6. Its secrets remained unknown until 1986,
    它的秘密直到1986年才被人们发现
  7. when cavers dug through several metres of loose rock
    洞穴专家们在松散的岩层中 挖出了一条几十米深的通道

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 308 行

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