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来源：雅诚德英语网
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。
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。