acoustic mechanical efficiency的用法和样例：
- The mechanical efficiency of this machine is very low, which leads to its failure in finishing its task every month.
- If reducers with hard gear surface are applied, it will have long life and high mechanical efficiency.
- The invention has simple structure, stable performance, high mechanical efficiency, large transmission power, wide application range, and low price.
- Objective To investigate the relationship between the gross mechanical efficiency(GE) /cycling economy(CE) and the oxygen uptake capacity.