由于牛羊不能在恶劣的气候条件下生存，每年冬天都要把它们带到南方去。
Since sheep and cattle can't survive harsh climates, they needed to be taken south every winter.
如果冬天不是很冷，它们的叶子可能会保持绿色。
If the winter is not very cold, their leaves may stay green.
它们通常很难觅食，所以一些动物会在冬天来临前收集额外的食物并储藏起来，例如老鼠。
It is often hard for them to find food, so some animals such as mice collect extra food before winter and hide it.
这是因为食物几乎总是触手可及的，而且它们不需要为严酷的冬天储存大量的能量。
It's because food is almost always within reach, and they don't have to store up a lot of food energy for the harsh winters.
对三头阿拉斯加的黑熊的心率追踪显示出它们在冬眠前的平均每分钟55 下降低到了冬天里每分钟飘忽不定的14 下。
Heart rate tracking for three of the Alaska bears showed a drop from 55 beats per minute on average before hibernation to 14 erratic ones per minute in winter.
与许多冬天的绿色植物不同，它们的叶子很硬，因此需要很长时间来烹饪，莴苣菜几乎不需要烹饪。
Unlike the many winter greens that have tough leaves and thus require a lengthy cooking time, those of escarole need little or no cooking.
麋鹿穿过冬天的冰雪，到达苏必利尔湖的皇家岛，在那里，它们没有天敌，自由繁殖。
Moose reached Isle Royale in Lake Superior by crossing over winter ice and multiplied freely there in isolation without predators.
关于这些蝴蝶最令人惊奇的事情是，它们返回墨西哥的同一棵树，那是它们的高祖父母曾经在冬天栖居过的树。
The most amazing thing about these butterflies is that they return to the very same trees in Mexico that their great-great-grandparents used the winter before.
冬天的时候，它们很可能待在树上，共同筑巢。
她知道，它们还没有储藏足够度过这早到冬天的食物！
She knew that they wouldn't have stored enough food to survive such an early winter!
土拨鼠在一个特别的冬眠洞穴中冬眠度过冬天，它们的呼吸和心跳慢到和蜗牛差不多，体温比冰点稍高一点。
Groundhogs spend the winter hibernating in a specially dug hibernation burrow, their breathing and heartbeats slowed to a snail's pace, their body temperatures not too far above freezing.
冬天又来临的时候，乔迪把虫子移进屋里，这样它们就安然地过冬了。
When winter came Jody took the worms inside so they would stay warm.
冬天又来临的时候，乔迪把虫子移进屋里，这样它们就安然地过冬了。
When winter came Jody took the worms inside so they would stay warm。
据英国国民托管组织的自然保育专家马修·奥茨解释说，“春天来得太早对很多物种其实是个灾难，因为它们繁殖的太早，后代就很容易受到突如其来的寒潮或降雨影响。 寒冷的冬天让动物能够正常冬眠，而温暖的春天和早早到来的夏天为昆虫创造了理想的环境来大量繁殖，并进而保证了秋天果园、树林和灌木丛里各种浆果的大丰收。”
He said that very early springs can prove disastrous for species who breed too early making their offspring susceptible to unexpected cold or wet snaps later in the season.
它们中的一些睡了整整一个冬天。
冬天的时候，光光的树枝附上了毛茸茸的一层霜，在太阳底下发着光，你都害怕一不小心碰到它们就散落一地。
In winter, the bare branches grow furry with frost.They sparkle in the sun, and you're afraid to touch them in case they shatter.
在南极洲的冬天，海湾的水面都被冻住了，它们就会去捕捉冰层下面的磷虾为食。
When the gulf waters freeze over during the Antarctic winter, they hunt for the krill that lives underneath the ice surface.
去年冬天，除非她用吸尘器将它们统统吸起来，通常几天就要进行一次，否则整个楼层都是它们的了。
Last winter, unless she vacuumed them up, often several times a day, they took over the upper floors of her home. Outside, it is even worse.
我会告诉他，在冬天鸭子们哪儿也不去。它们大多就呆在这儿，然后前往那个水库，那儿最近成了它们的新家。
I would have told him that the ducks don't go anywhere in winter-they mainly stay right here and head for the Reservoir, where recently counted them.
对于一些动植物来说，在今年暖冬天气里突然遇到一场大雪使它们感到措手不及，但是照片上这匹马显然做好了天气变化的准备。
Flora and fauna will view the snow as a bit of a shock after the mild winter.But at least this horse was well dressed for the change in weather.
冬天的时候，光光的树枝附上了毛茸茸的一层霜，在太阳底下发着光，你都害怕一不小心碰到它们就散落一地。
In winter, the bare branches grow furry with frost. They sparkle in the sun, and you're afraid to touch them in case they shatter.
在16世纪的一个冬天，当法国士兵被困在罗马城外时，他们躺在这座城市的粪堆上，靠它们的发酵取暖。
When French soldiers were stranded outside Rome one winter in the 16th century, they lay on the city's dunghills to soak up warmth from the fermenting matter.
一些靠冬天打猎喂它们的雪橇狗的猎人们，已经无法继续养大量的狗了，只好将狗都猎杀了。
Some hunters, who relied on winter game to feed their sled dogs, have been unable to continue to support large Numbers of dogs, and have been shooting them.
斯坦福大学霍普金斯海洋站的萨尔瓦多·乔根森博士发现，冬天，食人鲨会离开海豹聚居地(整个夏天它们都在那里以海豹为食)，动身前往温暖的水域。
Dr Salvador Jorgensen, of Stanford University's Hopkins Marine station, found that in winter, sharks leave seal colonies, where they feed all summer, and set off for warmer waters.
不像北部的伙伴，这里的生物全年都生活在温和的天气里，所以它们从来没有适应过从暖和的夏天变到寒冷的冬天。
Unlike their northern counterparts, they enjoy balmy weather all year, so have never adapted to freezing winters alternating with warm summers.
我们把它们放在热气腾腾的洗碗水中，同时又冰冻在冬天的气候下，并且用各种各样的化学品，但很多情况下都不会戴手套的。
We put them in steaming hot dishwater and freezing winter weather and use chemicals galore, many times without gloves.
有可能它们是在冬天的时候缩水了，但是我不这样认为。
It is possible that they got smaller during the winter, but I do not think so.
在秋天一些动物开始吃更多的食物，以便它们在冬天不吃任何东西。
Some animals start eating more food in autumn because they will not eat anything in winter.
在秋天一些动物开始吃更多的食物，以便它们在冬天不吃任何东西。
Some animals start eating more food in autumn because they will not eat anything in winter.
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