在冬天跑步是需要很大的自律力的。
筒仓发明之前，因为没有青草可以吃，奶牛在冬天产奶量减少。
Before silos were invented, cows gave less milk during winter because they had no green grass to eat.
即使在夏天，这个地方看上去也并不太宜人：在冬天，条件一定非常恶劣。
Even in summer this place did not look exactly hospitable: in winter, conditions must have been exceedingly harsh.
人的嘴唇和手在冬天常常皲裂。
这是一台可以在冬天温暖我们双脚的机器。
过去的人们在冬天很难吃到新鲜的蔬菜，是吗？
People in the past could hardly eat fresh vegetables in winter, could they?
秋天在冬天之前。
在冬天的夜晚，巴黎的街灯有一个光环，像蒲公英。
During winter evenings, Paris's streetlamps have a halo and resemble dandelions.
北极的海冰通常在春天和夏天融化，然后在冬天形成。
Arctic sea ice usually melts in spring and summer, then grows in winter.
在冬天，ECC可以通过电流加热，从而防止结冰。
In the winter, ECC can be heated by passing an electric current through it, thereby preventing ice buildup.
“孩子们在冬天穿虎头鞋，”她说，“它们又漂亮又暖和。”
"Kids wear tiger-head shoes in winter," she said."They are pretty and warm."
古代的人们相信这种植物可以驱除邪灵，防止他们在冬天生病。
People in ancient times believed that the plant could drive away evil spirits and prevent them from catching an illness in winter.
看看屋顶的斜坡，陡峭的角度有助于阻挡所有在冬天积累的雨雪。
And look at the slope of the roof, the steep angle helps keep off all that rain and snow that accumulates in the winter.
事实是这样的：为了在冬天有肉吃，人们会用盐来保存肉，而不是用香料。
What actually was true was this: In order to have meat for the winter, people would preserve it in salt, not a spice.
除此之外，在中国北方的人们还没有集中供暖的时候，他们在冬天很难御寒。
Besides this, before people in northern China had central heating, it was hard for them to prevent the cold in winter.
在冬天，一个城市产生的热量可以与太阳提供的热量相等，甚至超过这一数值。
In winter the heat produced by a city can equal or surpass the amount of heat available from the Sun.
在冬天的波士顿，这个实验进行的非常好，因为我们一直处于充满静电的环境中。
In Boston in the winter, this experiment worked very well because we were always in an environment full of static electricity.
这些微生物可以让土壤中植物生长所需的氮含量增加，在冬天让植物仍保持活跃。
These microbes enable the soil to have more nitrogen, which plants need to live and they remain quite active during the winter.
在冬天，当冰岛人完成了他们的日常工作，他们会有很多特殊的活动来度过漫长的黑夜。
In winter, when people in Iceland complete their daily work, they will have a lot of special activities to spend the long dark night.
那里天气很糟糕，尤其是在冬天，而且没有像波士顿内的城区这样有趣的古城区来弥补这一缺陷。
The weather is terrible, particularly in winter, and there's no interesting old city to make up for it, as there is in Boston.
然而那个地区当地的常绿松树可以为雪遮阴，吸收辐射，而白桦树在冬天则会落叶，从而使辐射被雪反射。
Whereas the region's native evergreen pines shade the snow and absorb radiation, birches would shed their leaves in winter, thus enabling radiation to be reflected by the snow.
如果你在冬天剥桦树皮，我们称它为“冬树皮”，另外一层更加坚硬的紧贴树皮的树层就可以生产出更强更硬的材料。
If you peel birch bark in the winter, we call it "the winter bark", another layer, a tougher inner layer of the tree adheres to the bark, producing a stronger material.
那些花一大笔钱买了一个户外加热浴缸的纽约人现在承认，他们很少使用它，“因为我们在冬天负担不起加热它的费用。”
The New Yorkers who spent a bundle on an outdoor hot tub now admit they rarely use it, "because we can't afford to heat it in winter".
在冬天，一辆汽车产生的热量足以温暖一间普通的房子，如果一间房子完全隔热，一个成年人也可以产生足够多的热量来温暖它。
An automobile produces enough heat to warm an average house in winter, and if a house were perfectly insulated, one adult could also produce more than enough heat to warm it.
在冬天，它完全被海冰覆盖。
在冬天，清晨甚至会有霜冻。
一个在冬天之后、夏天之前。
在冬天，花园里的花草树木变得干燥脆弱。
In winter, the flowers and trees in the garden became dry and weak.
这些柴火能够让他们朋友的家里在冬天保持温暖。
The firewood allowed their friends to keep their homes warm for the winter.
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