accelerating period meaning in Chinese

加速期间
加速周期

A discussion of contradiction between people and land in the accelerating period of urbanization process
城市化进程进入加速期的人地矛盾问题探讨
Accelerating noise was measured and analyzed for a passenger car , the inlet air noise of its engine has been found to be the main noise source during the car accelerating period
运用该技术对某汽车的加速噪声进行测量和分析，发现发动机进气噪声是该车主要的加速噪声源。