fú yóu / de / shēng mìng / suī rán / duǎn zàn / dàn / tā men / zài / shuǐ zhōng / shēng cún / de / shí qī / què / hěn cháng

蜉蝣的生命虽然短暂，但它们在水中生存的时期却很长。

Although the lifespan of mayflies is short, the period they spend living in water is quite long.