free of stamp

例句：

1. 1. The package is free of stamps, so it can be sent withouta fee.
   这个包裹免邮费，可以免费寄送。
2. 2. We are free ofstamps for the next two weeks.
   我们在接下来的两周内免邮费。
3. 3. The postoffice offers free of stamp delivery services tocertain areas.
   邮局为某些地区提供免邮费的快递服务。