| This is our planet's final frontier, an inner world where only the most adventurous dare to go. Beneath our feet are countless miles of cave shafts and passages. The Cave of Swallows in Mexico, 400 metres to the bottom, deep enough to engulf the Empire State Building. This is the biggest cave shaft in the world. Yet these depths were first explored only two years before men landed on the moon. Today caves remain the least explored places on earth. However, human beings are seldom the first to reach these black, damp places. Here, live some of the strangest and least-known animals on the planet. | |
| 这是我们这个星球上人类探险活动最晚涉及的地方。这是一个只有最大胆的探险者才敢进入的内部世界。在我们的脚下有长度无法计算的众多坑穴和通道。墨西哥的燕子洞，深达400米，足以把整个帝国大厦装入其中。这是地球上最大的洞穴，但直到人类登上月球的前两年才有人对它进行探索。今天，洞穴是人类在地球上探索最少的地方。而且这些黑暗潮湿的洞穴的最先光顾者很少是人类。这里生活着地球上一批最奇特、人类了解最少的动物。 |
| This is our planet' s final frontier, an inner world where only the most adventurous dare to go. Beneath our feet are countless miles of cave shafts and passages. The Cave of Swallows in Mexico, 400 metres to the bottom, deep enough to engulf the Empire State Building. This is the biggest cave shaft in the world. Yet these depths were first explored only two years before men landed on the moon. Today caves remain the least explored places on earth. However, human beings are seldom the first to reach these black, damp places. Here, live some of the strangest and leastknown animals on the planet. | |
| zhe shi wo men zhe ge xing qiu shang ren lei tan xian huo dong zui wan she ji de di fang. zhe shi yi ge zhi you zui da dan de tan xian zhe cai gan jin ru de nei bu shi jie. zai wo men de jiao xia you chang du wu fa ji suan de zhong duo keng xue he tong dao. mo xi ge de yan zi dong, shen da 400 mi, zu yi ba zheng ge di guo da sha zhuang ru qi zhong. zhe shi di qiu shang zui da de dong xue, dan zhi dao ren lei deng shang yue qiu de qian liang nian cai you ren dui ta jin xing tan suo. jin tian, dong xue shi ren lei zai di qiu shang tan suo zui shao de di fang. er qie zhei xie hei an chao shi de dong xue de zui xian guang gu zhe hen shao shi ren lei. zhe li sheng huo zhao di qiu shang yi pi zui qi te ren lei liao jie zui shao de dong wu. |
| This is our planet' s final frontier, an inner world where only the most adventurous dare to go. Beneath our feet are countless miles of cave shafts and passages. The Cave of Swallows in Mexico, 400 metres to the bottom, deep enough to engulf the Empire State Building. This is the biggest cave shaft in the world. Yet these depths were first explored only two years before men landed on the moon. Today caves remain the least explored places on earth. However, human beings are seldom the first to reach these black, damp places. Here, live some of the strangest and leastknown animals on the planet. | |
| zhè shì wǒ men zhè gè xīng qiú shàng rén lèi tàn xiǎn huó dòng zuì wǎn shè jí de dì fāng. zhè shì yí gè zhǐ yǒu zuì dà dǎn de tàn xiǎn zhě cái gǎn jìn rù de nèi bù shì jiè. zài wǒ men de jiǎo xià yǒu cháng dù wú fǎ jì suàn de zhòng duō kēng xué hé tōng dào. mò xī gē de yàn zi dòng, shēn dá 400 mǐ, zú yǐ bǎ zhěng gè dì guó dà shà zhuāng rù qí zhōng. zhè shì dì qiú shàng zuì dà de dòng xué, dàn zhí dào rén lèi dēng shàng yuè qiú de qián liǎng nián cái yǒu rén duì tā jìn xíng tàn suǒ. jīn tiān, dòng xué shì rén lèi zài dì qiú shàng tàn suǒ zuì shǎo de dì fāng. ér qiě zhèi xiē hēi àn cháo shī de dòng xué de zuì xiān guāng gù zhě hěn shǎo shì rén lèi. zhè lǐ shēng huó zháo dì qiú shàng yī pī zuì qí tè rén lèi liǎo jiě zuì shǎo de dòng wù. |
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