caissons

1.(打捞沉船用的)潜函,沉箱;充气浮筒;(船坞等的)铁浮门;蓄气装置

2.【建】藻井

3.弹药箱;弹药车;地雷箱

1.a bottomless watertight chamber filled with compressed air, used as a base from which construction work is carried out underwater

2.a hollow structure attached to a sunken object such as a wrecked ship, then pumped full of air until it acts as a float, raising the object to the surface

3.a floating watertight structure used to keep water from entering a dry dock, canal lock, or basin

4.a large container for ammunition

5.a two-wheeled horse-drawn vehicle, formerly used to carry ammunition but now often used to carry coffins at state or military funerals

6.a box of explosives, formerly used as a land mine