double fault

例句：

1. 1. He made two mistakes that cost me a lot of money.
   他犯了两个错误，让我损失了很多钱。
2. 2.The teacher noticed the double fault in his report and gave him a failing grade.
   老师注意到了报告中的双错，给了他不及格的成绩。
3. 3.They double checked their work to avoid any double faults.
   他们反复检查工作以避免任何双重错误。