onprep.在 ... 之上；由 ... 支撑着；在（某一天）；关于；基于adv.穿着；向前（移动)；表示持续性adj.表示已连接、处于工作状态或使用中；发生；值班oncoma(=tumor)(肿)瘤

1. I will indemnify you for any expenses you may incur on my behalf.
   我会偿付你为了我而负担的任何花费。
2. I undertook to indemnify them for expenses incurred on my behalf.
   我负责偿还他们为我而用的全部花费。
3. He doesn't have to exert himself on my behalf.
   他不必为我费那么大力气。