1. Over the past two million years, colder glacial periods have alternated with warmer interglacial periods. 在过去的200万年里,寒冷的冰期与较暖和的间冰期交替出现。
2. Then, as blazing sunshine alternated with drenching rains, the harsh, barren surfaces of the black rocks slowly began to soften. 然后,随着炽热的阳光和滂沱的大雨交替出现,黑色岩石粗糙而贫瘠的表面开始慢慢软化。
3. She alternated singing and dancing. 她一会儿唱歌,一会儿跳舞。
4. Joy and grief alternated in my heart. 我心中悲喜交替。
5. Hope and fear alternated in my breast. 我忽而充满希望,忽而担心。