Faili法伊利failvi.失败；没做成某事；表现欠佳；用完；衰退vt.辜负；放弃；缺少；不及格n.不及格；没做成fail soft system故障弱化系统fail-soft mode[计] 故障弱化方式fail in business做生意不成功fail in the exam考试不及格fail safe system安全系统fail temperature破坏温度failing patterns溃坝模式fail to pay debt逋债fail-safe tape故障保护磁带failing strength破坏强度

1. They failed to find any trace of the runaways.
   他们未能找到逃跑者的任何踪迹。
2. I have failed to reach them by postal inquiries.
   我未能通过邮政查询与他们取得联系。