In the past, distillation has always been too expensive; but a great deal of success in cheapening the process has been achieved in the last few years. Some clever ideas have been thought out to do this.是什么意思_In the past, distillation has always been too expensive; but a great deal of success in cheapening the process has been achieved in the last few years. Some clever ideas have been thought out to do this.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句