n.枪眼；炮眼
The napalm rolled over and down the front of the recessed embrasure. 那一发凝固汽油弹滚落到了嵌壁枪眼的前方。
The window was an embrasure in an enormously thick wall. 窗户是个炮眼,墙壁异乎寻常的厚。
Tanks'embrasure wouldn't let to see the road but the white clouds in the sky. 从坦克的观察窗商只能看到蓝天白云而无法看到路面上的情况。
外展隙
