(~s)
A ~ is a vertical tube which people inside submarines can look through to see above the surface of the water.
N-COUNT
(~s)
A ~ is a vertical tube which people inside submarines can look through to see above the surface of the water.
N-COUNT
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012