释义
n.
a large watertight chamber, open at the bottom, from which the water is kept out by air pressure and in which construction work may be carried out under water
沉箱（底部开口，因有气压而使水无法进入，从而可进行施工的大型防水室）。
a floating vessel or watertight structure used as a gate across the entrance of a dry dock or basin
浮箱式坞门。
〈史〉 弹药箱；弹药运输箱。
词源
"late 17th cent.: from French, literally ‘large chest', from Italian