It is impossible to give a satisfactory explanation for a potholer's motives.
对于洞穴勘探家的动机,不可能作出令人满意的解释.
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采用多样性指数,相对丰富度及离散度对洞穴景观多样性进行了定量表达与评判。
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Mineral composition of clastic cave deposits from the site of Peking man and Its Implications
北京人遗址洞穴碎屑堆积的矿物组分特征及其意义
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Unfortunately it was not allowed to take photos there, so we cannot show you this.
很可惜那里禁止拍照, 所以我们无法向大家展示这个洞穴的迷人之处.
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The currents swirling between tunnels and caves don't always lead back to open water.
还有涌流的漩涡在隧道和洞穴之间时常不能引导潜水者回到水的开口.
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Primitive people lived in caves and made tools from stones and animal bones.
原始人住在洞穴里并以石头和动物的骨来做工具.
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