sister ships

例句：

1. 1. The sisters' boats were docked at the harbor.
   姐妹们的船只停靠在港口。
2. 2. The sister ships are scheduled to sail together.
   姐妹船计划一起航行。
3. 3.The sister ships have been in port for several days now.
   姐妹船已经在港口停留了几天。