watertight hatch

例句：

1. 1. The ship's watertight hatches are designed to keep out any water that might enter the cabin.
   船的防水舱口设计用来防止任何可能进入机舱的水。
2. 2. The pilot had to open the watertight hatch to let the passengers out during the emergency evacuation.
   在紧急疏散时，飞行员不得不打开防水舱口让乘客们出来。
3. 3. The engineers worked tirelessly to ensure that all the watertight hatches were properly secured before the launch.
   工程师们不辞辛劳地工作以确保所有防水舱口在发射前都正确固定。