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...
Our follicles produce hair that is straight, wavy or curly.我们的毛囊生产的毛有直的, 波浪式的或卷曲的.The ovarian follicles are embedded in the stroma of the cortex.卵巢皮质的基质中有许多卵泡.Most ovarian follicles undergo an involutional process called...