dust-tight

例句：

1. 1. The room was so dusty that it looked like it hadn't been cleaned in years.
   房间太脏了，看起来像是几年没打扫过。
2. 2.The old car is dusty-coated with grime and oil.
   这辆旧车被灰尘和油渍覆盖得严严实实。
3. 3. The farmer had to clean the barn thoroughly before selling the grain.
   农民在出售粮食前必须彻底清理谷仓。