caisson/ˈkeɪsn; `kesn/ n1 large watertight box or chamber in which men can work under water (eg when building foundations) 沉箱（工人进行水下作业, 如建底座时所乘的大潜水箱）.2 large box (usu on wheels) in which ammunition is carried 弹药箱; （通常为）弹药车.
牛津英汉双解词典