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...
They may need some additional inputs and advice on how to improve the management of their farms.他们可能需要听取更多的意见和建议来改善农场的经营。In other cases, such as inventories, inputs and outputs are both continuous.在另一些情况下, 比如存货, 其投入和产出都是...