ballast tank

短语

词形变化

ballast tanks 复数 ballast tanks

释义与例句

n.
  1. 1.

    One of several external or internal tanks fitted in submarines; when filled with seawater they allow the boat to submerge; when emptied using compressed air buoyancy is restored and the vessel rises towards the surface. Auxiliary ballast tanks within the pressure hull allow the submarine to be trimmed.