英语语法分析

In the 860's the Byzantine Empire began to recover from Arab incursions so that by 872 the military balance with the Abbasid Caliphate had been permanently altered in the empire's favor.

860年代，拜占庭帝国开始从阿拉伯人的入侵中恢复，因此到872年，与阿拔斯王朝的军事平衡永久地成为帝国的优势。