mail steamer

例句：

1. 1.The mail steamer arrived safely at the port.
   邮船安全抵达港口。
2. 2. She boarded the mail steamer to go on a long journey.
   她登上了邮船开始了长途旅行。
3. 3. The mail steamer was carrying a large shipment of goods.
   邮船正运送着一批货物。