hull maintenance

例句：

1. 1. The ship's hull needs regular maintenance to ensure safety.
   这艘船的船体需要定期维护以确保安全。
2. 2. The captain has ordered a thorough hull maintenance inspection before the next voyage.
   船长已经下令在下次航行前进行彻底的船体维护检查。
3. 3. The crew members are responsible for maintaining the ship's hull in good condition.
   船员们负责确保船体的船体状况良好。