“频仍”造句
中东这一地区一直战乱
频仍。
The Middle East has often been a theatre of war.
机器常裸露着，因此事故
频仍。
Machinery was often unprotected and accidents were frequent.
北匈奴继续与汉为敌,不断侵扰边境,双方战争
频仍.
The Northern Xiongnu went on opposing against the Han Dynasty and invaded the border area often.