many countries are using natural gas ,wind

many countries are using natural gas ,wind Many countries are increasing their use of natural gas,wind 26.Many countries are increasing their use of natural gas, 综合67.Many countries are increasing their use of natural gas, the scientist suggest using natural gas ________fuel to make 英语翻译oil,coal,natural gas,solar heat,wind,etc.But the convent natural gas power Human beings are using up the planet' s natural resources. Gas Hydrate与natural gas的区别 Workers are paid w____in many western countries Many countries are making rules -------(fight)pollution. How many countries are there in the