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At dawn the first adult midges start to break out. Soon, millions upon millions of newly hatched lake flies are taking to the wing. Early explorers told tales of lakes that smoked, as if on fire. But these spiralling columns hundreds of metres high are mating flies. Once the flies have mated, they will all drop to the water surface, release their eggs and die. Malawi may look like an inland sea, but it' s dwarfed by the world' s largest lake Baikal in Eastern Siberia. 400 miles long and over a mile deep, Baikal contains 1 5 of all the fresh water found in our planet' s lakes and rivers. For five months of the year it' s sealed by an ice sheet over a metre thick. |
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líng chén dì yì zhī chéng nián yáo wén chōng shuǐ ér chū. bù jiǔ, yì wàn zhǐ gāng fū huà de yáo wén fēi qǐ lái le. zǎo qī de tàn xiǎn zhě men shuō dào, zhèi xiē huì mào yān, hǎo xiàng zhe le huǒ yí yàng. dàn shì zhèi xiē gāo dá shù bǎi mǐ de pán xuán de yān zhù shí jì shang shì zhèng zài jiāo pèi de yáo wén. jiāo pèi wán bì zhī hòu tā men huì jiàng luò dào hú miàn chǎn luǎn, rán hòu sǐ qù. mǎ lā wéi hú kàn qǐ lái xiàng yí gè nèi lù hǎi, dàn bǐ qǐ shì jiè shang zuì dà de hú, wèi yú xī bó lì yà dōng bù de bèi jiā ěr hú, tā jiù xiāng xíng jiàn chù le. bèi jiā ěr hú zhǎng 600 duō gōng lǐ, shēn dá 1600 duō mǐ, tā de shuǐ liàng zhàn dì qiú quán bù hé hú dàn shuǐ zǒng liàng de 1 5. měi nián yǒu 5 gè yuè shí jiān tā dōu bèi hòu dá 1 mǐ de bīng céng fù gài. |