1The fire department used a large tank to store water for fighting fires.
2The army deployed a tank to the front lines to provide cover for the infantry.
3The scuba diver checked the air tank on her back to make sure it was full before descending into the water.
4The oil tanker was a massive ship with several tanks that could hold millions of gallons of crude oil.
5The aquarium was a large tank filled with exotic fish and other sea creatures.