Mayflies， after hatching and then spending one to three years developing as naiads， live only one day as adults. During this single day， they molt twice， mate， and lay eggs in water. Because these adults do not have fully developed mouth parts， they do not feed.
蜉蝣孵化出來(lái)后有1——3年作為稚蟲(chóng)生長(zhǎng)，作為成蟲(chóng)只活一天。在這一天中它要蛻兩次皮，交配，在水中產(chǎn)卵。因?yàn)槌上x(chóng)沒(méi)有發(fā)展完好的口器，因而不吃東西。
The female pigeon cannot lay eggs if she is alone. In order for her ovaries to function， she must be able to see another pigeon. If no other pigeon is available， her own reflection in a mirror will suffice.
單獨(dú)一只雌鴿子下不出蛋，必須在它見(jiàn)到另一只鴿子時(shí)其卵巢才能發(fā)揮作用。要是沒(méi)有別的鴿子，讓它在鏡子里照見(jiàn)自己也行。
A newborn turkey chick has to be taught to eat， or it will starve. Breeders spread feed underfoot， hoping the little ones will peck at it and mouths open during rainstorms. Lots of them drown as a result.
必須教新孵出來(lái)的火雞雛鳥(niǎo)進(jìn)食，否則它們就會(huì)餓死。這是喂火雞者將食物灑在小火雞腳下，希望它們啄食時(shí)發(fā)現(xiàn)的。下暴雨的時(shí)候，火雞往往會(huì)張大著嘴向上看，許多火雞因此而淹死。
The stegosaurus， a giant dinosaur that grew to more than 18 feet long and was armed with enormous bony plates on its neck， back， and tail， had a brain that weighed only 2 ounces and was no bigger than a walnut.
一種叫做劍龍的大型恐龍能長(zhǎng)到18英尺長(zhǎng)，全身的頸部、背部和尾部都長(zhǎng)有骨片?？墒撬哪X子僅有2盎司重，只有胡桃那么大。
蜉蝣孵化出來(lái)后有1——3年作為稚蟲(chóng)生長(zhǎng)，作為成蟲(chóng)只活一天。在這一天中它要蛻兩次皮，交配，在水中產(chǎn)卵。因?yàn)槌上x(chóng)沒(méi)有發(fā)展完好的口器，因而不吃東西。
The female pigeon cannot lay eggs if she is alone. In order for her ovaries to function， she must be able to see another pigeon. If no other pigeon is available， her own reflection in a mirror will suffice.
單獨(dú)一只雌鴿子下不出蛋，必須在它見(jiàn)到另一只鴿子時(shí)其卵巢才能發(fā)揮作用。要是沒(méi)有別的鴿子，讓它在鏡子里照見(jiàn)自己也行。
A newborn turkey chick has to be taught to eat， or it will starve. Breeders spread feed underfoot， hoping the little ones will peck at it and mouths open during rainstorms. Lots of them drown as a result.
必須教新孵出來(lái)的火雞雛鳥(niǎo)進(jìn)食，否則它們就會(huì)餓死。這是喂火雞者將食物灑在小火雞腳下，希望它們啄食時(shí)發(fā)現(xiàn)的。下暴雨的時(shí)候，火雞往往會(huì)張大著嘴向上看，許多火雞因此而淹死。
The stegosaurus， a giant dinosaur that grew to more than 18 feet long and was armed with enormous bony plates on its neck， back， and tail， had a brain that weighed only 2 ounces and was no bigger than a walnut.
一種叫做劍龍的大型恐龍能長(zhǎng)到18英尺長(zhǎng)，全身的頸部、背部和尾部都長(zhǎng)有骨片?？墒撬哪X子僅有2盎司重，只有胡桃那么大。