它们产下卵，要孵化整个冬天。
只需一个精子就可以使卵受精。
两天后他们把受精卵移植回我的体内。
Two days later, they implanted the fertilized eggs back inside me.
每只雌性在4月或5月份将只产一颗卵。
这些卵很快孵化成幼虫。
雌性的卵在沙漠表面下孵化。
蜘蛛宝宝是由卵变成的。
一个卵变成一条金鱼。
即使鳄鱼成功地从卵中孵化出来，问题也不会结束。
The problems do not end if crocodiles successfully hatch from the eggs.
项目通常首先从确定一条让鲑鱼产过卵的河流开始。
Projects usually begin by identifying a stream that once allowed salmon to spawn.
酚类物质还会使卵变小，这会减少第二年毛虫的生长。
Phenols also make the eggs smaller, which reduces the growth of the following year's caterpillars.
在未受精卵中，这些物质是不活跃的，而且分布不均匀。
In the unfertilized egg, the substances are inactive and are not distributed homogeneously.
外层几乎是密封的，可以保护脆弱的蜂卵，以及后来的幼虫。
The casing is nearly airtight, which helps protect the vulnerable egg and later larva.
昆虫为生存而精心设计的卵，就挂在父母存放它们的地方孵化。
Engineered for survival, insect eggs hang on and hatch wherever their parents deposit them.
在锥实螺的例子中，研究表明右旋基因是在卵的形成期表达的。
In the case of Lymnaea peregra, studies indicate that a dextral gene is expressed during egg formation.
这些蜘蛛结成很大的网，雌性蜘蛛在上面用成百上千的卵悬挂茧。
These spiders spin large webs in which females suspend a cocoon with hundreds of eggs.
在滞育期间，小袋鼠呆在雌袋鼠的育儿袋里，因而推迟了子宫内第二个受精卵的发育。
During diapause, a young kangaroo stays in the female's pouch and growth of a second fertilized egg inside the uterus is delayed.
为了保证卵能得到一个温暖的迎接，她把育儿袋叼在嘴上，然后面向天空中太阳的方向。
To ensure the eggs receive a warm welcome she carries the egg pouch in her mouth presenting it to the sky following the sun.
比如，普通的苍蝇通过产下几千颗卵来繁殖后代，这样每只苍蝇的基因就被复制了上千遍。
For example, the common housefly reproduces by laying several thousand eggs, so each fly gene gets copied thousands of times.
然而，到了第12天，当它们长到3厘米长时，就会有成百上千微小的卵在雌蛙的身体下部形成。
By the twelfth day, however, when they are about 3 centimetre long, hundreds of tiny eggs form on the underbodies of the females.
与水生和海洋生物不同，陆生植物不能总是依靠水流来携带它们的生殖细胞和分散它们的受精卵。
Unlike aquatic and marine forms, land plants cannot always rely on water currents to carry their sex cells and disperse their fertilized eggs.
煎蛋水母，也被称为美杜莎水母，它的卵在海水中受精，然后发育成固定在海床有机体上的微小幼虫。
The fried egg jellyfish, also known as medusa, produce eggs that are fertilized in sea water, which then develop into a tiny larva fixed to sea bed organisms.
在许多动物中，以及在诸如果蝇卵的孵化乃至松鼠跑动的转轮这样的生物活动中，这种变化趋势一直受到广泛的研究。
This drift has been studied extensively in many animals and in biological activities ranging from the hatching of fruit fly eggs to wheel running by squirrels.
非同卵双生胎是两个受精卵同时在子宫着床的结果。
Non-identical twins are the result of two fertilized eggs implanting in the uterus at the same time.
起初，它是一个卵。
有些蜘蛛网可以用作盛卵箱。
一只章鱼每次会产下5万到20万个卵。
在美国，一种叫做滴滴涕的杀虫剂正在伤害隼卵。
In America, a pesticide, a chemical, called DDT was harming the falcon eggs.
她根据卵的大小、形状和存活的可能性将它们分成若干组。
She separates the eggs into groups based on their size, shape and possibility of survival.
她根据卵的大小、形状和存活的可能性将它们分成若干组。
She separates the eggs into groups based on their size, shape and possibility of survival.
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