狒狒逻辑61求助

哪位朋友帮忙把这道题的题干全部翻译成中文，谢谢！  

61。Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August.

    Investigators下结论道：the fatal airplane crash last August 不是由human failure造成的，从那时起，新的、更严格的、用来确定和报告机械故障的rules 开始生效，这个rules的生效解释了一个事实：since last August.，reports of airplane mechanical problems have increased in frequency by 50 percent

    这样可以吗？