| Rivers that flow over limestone often seem to completely disappear. When the water reaches a more resistant bed of limestone its course is altered. Once underground, the water takes on a new, more erosive power. During its journey from the surface the water absorbed carbon dioxide from the soil making it mildly acidic. And over millions of years this acid eats away the limestone creating a maze of caverns and passages that sometimes go on for miles. This is the biggest underground river passage in the world, so big a jumbo jet could fly through it. It's Deer Cave, in Borneo. The sheer size of Deer Cave allows some animals to gather there in huge numbers. | |
| 流过石灰岩地面的河流经常好像突然消失了。水流经过更能抗侵蚀的石灰岩河床时，会改变流向。一旦流入地下，雨水就会形成新的更大的侵蚀力。水在地表流过时候从土壤中吸收了二氧化碳，使它略带酸性，经过千百万年，这些酸性的水便把石灰岩冲蚀成洞穴迷宫，这些洞穴有的长达数公里。这是世界上最大的地下河通道，大到喷气式飞机可以通过。这是位于加里曼丹岛的鹿洞。因为洞穴很大，一些动物大量聚居在里面。 |
| Rivers that flow over limestone often seem to completely disappear. When the water reaches a more resistant bed of limestone its course is altered. Once underground, the water takes on a new, more erosive power. During its journey from the surface the water absorbed carbon dioxide from the soil making it mildly acidic. And over millions of years this acid eats away the limestone creating a maze of caverns and passages that sometimes go on for miles. This is the biggest underground river passage in the world, so big a jumbo jet could fly through it. It' s Deer Cave, in Borneo. The sheer size of Deer Cave allows some animals to gather there in huge numbers. | |
| liu guo shi hui yan di mian di he liu jing chang hao xiang tu ran xiao shi le. shui liu jing guo geng neng kang qin shi de shi hui yan he chuang shi, hui gai bian liu xiang. yi dan liu ru di xia, yu shui jiu hui xing cheng xin de geng da de qin shi li. shui zai di biao liu guo shi hou cong tu rang zhong xi shou le er yang hua tan, shi ta lue dai suan xing, jing guo qian bai wan nian, zhei xie suan xing de shui bian ba shi hui yan chong shi cheng dong xue mi gong, zhei xie dong xue you de chang da shu gong li. zhe shi shi jie shang zui da de di xia he tong dao, da dao pen qi shi fei ji ke yi tong guo. zhe shi wei yu jia li man dan dao de lu dong. yin wei dong xue hen da, yi xie dong wu da liang ju ju zai li mian. |
| Rivers that flow over limestone often seem to completely disappear. When the water reaches a more resistant bed of limestone its course is altered. Once underground, the water takes on a new, more erosive power. During its journey from the surface the water absorbed carbon dioxide from the soil making it mildly acidic. And over millions of years this acid eats away the limestone creating a maze of caverns and passages that sometimes go on for miles. This is the biggest underground river passage in the world, so big a jumbo jet could fly through it. It' s Deer Cave, in Borneo. The sheer size of Deer Cave allows some animals to gather there in huge numbers. | |
| liú guò shí huī yán dì miàn dí hé liú jīng cháng hǎo xiàng tū rán xiāo shī le. shuǐ liú jīng guò gèng néng kàng qīn shí de shí huī yán hé chuáng shí, huì gǎi biàn liú xiàng. yī dàn liú rù dì xià, yǔ shuǐ jiù huì xíng chéng xīn de gèng dà de qīn shí lì. shuǐ zài dì biǎo liú guò shí hòu cóng tǔ rǎng zhōng xī shōu le èr yǎng huà tàn, shǐ tā lüè dài suān xìng, jīng guò qiān bǎi wàn nián, zhèi xiē suān xìng de shuǐ biàn bǎ shí huī yán chōng shí chéng dòng xué mí gōng, zhèi xiē dòng xué yǒu de cháng dá shù gōng lǐ. zhè shì shì jiè shang zuì dà de dì xià hé tōng dào, dà dào pēn qì shì fēi jī kě yǐ tōng guò. zhè shì wèi yú jiā lǐ màn dān dǎo de lù dòng. yīn wèi dòng xué hěn dà, yī xiē dòng wù dà liàng jù jū zài lǐ miàn. |
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