where they're well protected from the outside elements 它们在此完全不受外界因素的干扰

69. allows some animals to gather there in huge numbers.
    使得大批动物到此聚集
70. A staggering 3 million wrinkle-lipped bats live here.
    这里住着数量惊人的300万只犬吻蝠
71. The bats roost high on the walls and ceilings
    这些蝙蝠倒挂在洞壁和天顶上
72. where they're well protected from the outside elements
    它们在此完全不受外界因素的干扰
73. and safe from predators.
    还能躲开天敌
74. And while they're up here
    它们高悬在洞穴上方时
75. the bats produce something very important.
    会产生一种非常重要的东西

来自《行星地球 第一季 第四集 Planet Earth S01E04 洞穴》第 72 行