| They're cave swiftlets. Like bats they use echolocation to navigate. We need lights to see what's going on, but in the pitch black the swiftlets manage unerringly to locate their individual nesting sites, which are only a few centimetres across. It's a remarkable skill and one we still do not fully understand. These birds are unusual for another reason. Their little cup-like nests are made entirely from threads of saliva. It takes more than 30 days to complete one. Their nests are very precious objects, and not only for the birds. For 500 years people have been harvesting the nests of cave swiftlets. | |
| 它们是穴金丝燕。和蝙蝠一样，它们依靠回声来做导向。我们需要有光线才能看清楚东西，但是，在一片漆黑的情形下，穴金丝燕却可以准确找到只有几厘米宽的巢穴。这是一种非凡的本领，到现在人类还无法完全了解。这种鸟还有一种不同寻常之处。它们像杯子一样的巢完全是用自己的唾液筑成的。要筑成这样一个巢穴至少需要整整30天时间，它们的巢非常珍贵，这不仅对穴金丝燕而言。500年来，人类一直在摘取这些金丝燕的窝。 |
| They' re cave swiftlets. Like bats they use echolocation to navigate. We need lights to see what' s going on, but in the pitch black the swiftlets manage unerringly to locate their individual nesting sites, which are only a few centimetres across. It' s a remarkable skill and one we still do not fully understand. These birds are unusual for another reason. Their little cuplike nests are made entirely from threads of saliva. It takes more than 30 days to complete one. Their nests are very precious objects, and not only for the birds. For 500 years people have been harvesting the nests of cave swiftlets. | |
| ta men shi xue jin si yan. he bian fu yi yang, ta men yi kao hui sheng lai zuo dao xiang. wo men xu yao you guang xian cai neng kan qing chu dong xi, dan shi, zai yi pian qi hei de qing xing xia, xue jin si yan que ke yi zhun que zhao dao zhi you ji li mi kuan de chao xue. zhe shi yi zhong fei fan de ben ling, dao xian zai ren lei hai wu fa wan quan liao jie. zhe zhong niao hai you yi zhong bu tong xun chang zhi chu. ta men xiang bei zi yi yang de chao wan quan shi yong zi ji de tuo ye zhu cheng de. yao zhu cheng zhe yang yi ge chao xue zhi shao xu yao zheng zheng 30 tian shi jian, ta men de chao fei chang zhen gui, zhe bu jin dui xue jin si yan er yan. 500 nian lai, ren lei yi zhi zai zhai qu zhei xie jin si yan de wo. |
| They' re cave swiftlets. Like bats they use echolocation to navigate. We need lights to see what' s going on, but in the pitch black the swiftlets manage unerringly to locate their individual nesting sites, which are only a few centimetres across. It' s a remarkable skill and one we still do not fully understand. These birds are unusual for another reason. Their little cuplike nests are made entirely from threads of saliva. It takes more than 30 days to complete one. Their nests are very precious objects, and not only for the birds. For 500 years people have been harvesting the nests of cave swiftlets. | |
| tā men shì xué jīn sī yàn. hé biān fú yí yàng, tā men yī kào huí shēng lái zuò dǎo xiàng. wǒ men xū yào yǒu guāng xiàn cái néng kàn qīng chǔ dōng xī, dàn shì, zài yī piàn qī hēi de qíng xíng xià, xué jīn sī yàn què kě yǐ zhǔn què zhǎo dào zhǐ yǒu jǐ lí mǐ kuān de cháo xué. zhè shì yī zhǒng fēi fán de běn lǐng, dào xiàn zài rén lèi hái wú fǎ wán quán liǎo jiě. zhè zhǒng niǎo hái yǒu yī zhǒng bù tóng xún cháng zhī chù. tā men xiàng bēi zi yí yàng de cháo wán quán shì yòng zì jǐ de tuò yè zhù chéng de. yào zhù chéng zhè yàng yí gè cháo xué zhì shǎo xū yào zhěng zhěng 30 tiān shí jiān, tā men de cháo fēi cháng zhēn guì, zhè bù jǐn duì xué jīn sī yàn ér yán. 500 nián lái, rén lèi yī zhí zài zhāi qǔ zhèi xiē jīn sī yàn de wō. |
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