gǔ / dài / chéng / qiáng / shàng / cháng / shè / nǚ / qiáng / shì / bīng / kě / yǐ / dēng / gāo / bǐ / ní / chéng / wài

古代城墙上常设女墙，士兵可以登高俾倪城外。

Ancient city walls often had parapets where soldiers could climb up and look down at the area outside.