有效扭矩 meaning in English

effective torsional moment

To overcome the second , the transmission needs to include a gearbox providing a range of different ratios of input to output speed , enabling the engine ' s speed to be maintained within the useful range of torque output over a more or less wide range of vehicle speeds
对于第二个问题，可利用变速箱来安排不同的输入输出比，使发动机保持一定的转速，以便提供保持车辆速度的有效扭矩输出。