perforation rate

例句：

1. 1. The efficiency of the machineis directly related to its perforationrate.
   机器的效率与其穿孔率直接相关。
2. 2.The perforation rate of the newsteel plate is higher than that of theold one.
   新钢板的穿孔率比旧钢板高。
3. 3. The perforation rateof the oil well was reduced by5% due to the improvement in drilling technology.
   由于钻井技术的改进，油井的穿孔率降低了5%。