watertight housing

例句：

1. 1.The new car has a watertightdoor that keeps the interior dry.
   这款新车的门是防水的，可以保持车内干燥。
2. 2. The boat was watertight,so it could withstand the storm.
   这艘船防水做的很好，所以能抵御风暴。
3. 3. The raincoat is watertight, preventing any leaks from getting through.
   雨衣是防水的，防止任何水渗透进来。