要塞墙上内宽外窄漏斗状的开口可当炮眼射击孔门窗两侧向内渐宽的斜面斜面墙
The funnel-shaped openings on the fortress wall, which are wider inside and narrower outside, can be used as gun holes. The inclined surfaces on both sides of the doors and Windows gradually widen inward
以上为机器翻译结果，长、整句建议使用 人工翻译 。