an opening (in a wall or ship or armored vehicle) for firing through
同义词：port, embrasure
porthole例句
I peep out the porthole and see a sea of clouds.
我从飞机的舷窗向外张望，看到一片云海。
porthole详细解释
port.hole n.（名词）Nautical A small, usually circular window in a ship`s side.【航海】 舷窗：位于船的一侧的小的，通常为圆形的窗口An opening in a fortified wall; an embrasure.射击孔，炮眼：城墙上的开孔；炮眼
