adjustment letter

例句：

1. 1. The company sent a letter of adjustment to the customer for the overcharge.
   公司给顾客发了一封调整信，因为多收了费用。
2. 2. The teacher asked the students to write an adjustment letter to their parents about their homework.
   老师要求学生们给他们的父母写一封信，解释他们的家庭作业情况。
3. 3.After receiving the adjustment letter, the bank agreed to refund the overdraft fees.
   在收到调整信后，银行同意退还透支费。