phase mass

例句：

1. 1. The development of the new technology is a phase in the process of technological progress.
   新技术的发展是技术进步过程中的一个阶段。
2. 2. The research team has completed several phases of experiments.
   研究团队已经完成了几个实验阶段。
3. 3. The company is currently undergoing a phase of rapid expansion.
   该公司目前正在经历一个快速发展的阶段。