air-tight seal

例句：

1. 1. The door was sealed shut with a heavy padlock.
   门被厚重的锁锁上了。
2. 2.The car's air-tight seal prevented any odor from getting in.
   汽车的气密密封阻止了任何气味进入。
3. 3. The new product has a tight seal that keeps out dust and moisture.
   新产品有一个紧密的密封，可以防止灰尘和湿气进入。