Roller mill was invented in 1970’s as a result of an effort to overcome the shortcomings of tube mill.
Roller mill was invented in 1970’s as a result of an effort to overcome the shortcomings of tube mill.
立磨是七十年代发明得，是人们力图克服管磨得缺点所取得得一项成果。
Roller mill was invented in 1970’s as a result of an effort to overcome the shortcomings of tube mill.
立磨是七十年代发明得，是人们力图克服管磨得缺点所取得得一项成果。