two speed transmission造句

• The driving characteristics and control principle of rare earth magnet motor with variable flux and the principle of two speed transmission by wire are studied , and the motor and transmission are designed and integrated into the driving system
  对新型稀土变磁通电机的驱动特性及其控制原理、线控两挡变速器原理进行了研究，并进行了一体化设计。