周围的矿井里的确有沼气聚积。Methane gas does collect in the mines around here.废物腐烂时会产生沼气。As the waste materials decompose, they produce methane gas.目前我国户用沼气推广应用的规模上居国际首位.The application scale of digester is the first one in the world....
Kathy is a great mate, we are like sisters.凯茜是个很好的伙伴，我们亲如姐妹。I wish to express my gratitude to Kathy Davis for her immense practical help.凯茜·戴维斯实实在在地帮了大忙，我想对她表示感谢。My name is Kathy Flynn, and this is Jack Garcia.我叫凯西?弗林, 这...