Before silos were invented, cows gave less milk during winter because they had no green grass to eat.
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。
For a start, all animals, such as cows, pigs and sheep, always gas limed methane, which is the second most common green house gas after carbon dioxide.
首先，所有的动物，如牛、猪和羊，总是排出石灰甲烷气体，这是继二氧化碳之后第二常见的温室气体。
Whenever it got hot, they would take their cows up to a cool, green pasture in the mountains. Usually they stayed there with the cows all summer.
每到天热的时候他们就把牛群赶到山里凉快的牧场去，而且通常一呆就是整个夏天。
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