crew replacement

例句：

1. 1. The captain decided to replace the old crew with a new one.
   船长决定用新的船员替换旧的。
2. 2. The ship's crew replacement process is rigorous and thorough.
   船舶的船员替换过程严格而彻底。
3. 3. The new crew replacement has already begun training for their new roles.
   新船员替换已经开始培训他们的新角色。