modal efficient mass

例句：

1. 1.The efficiency of the new machine is significantly higher than that of the old one.
   这台新机器的效率比旧的高出很多。
2. 2.The modal efficient mass concept has been widely applied in engineering design.
   模态效率质量概念在工程设计中得到了广泛应用。
3. 3. The study on modal efficient mass has important theoretical and practical significance.
   模态效率质量的研究具有重要的理论和实践意义。