Definition
to send a letter to an organization requesting them to provide you with an item
写信请求
I need to write away for a copy of my medical records.
我需要写信申请我的医疗记录副本。
She decided to write off for free samples to test the quality of the product.
她决定写信申请免费样品来测试产品的质量。
We should write away for more information on the university's admissions.
我们应该写信索取更多关于大学入学的信息。