1. Alternated between happiness and depression. 
   时而快乐，时而沮丧
2. Sometimes it's warm, then freezing. 
   时而暖和，时而寒冻。
3. It is sometimes warm and sometimes cold. 
   天气时而热时而冷。
4. She went hot and cold by turns. 
   她时而发烧时而发冷。
5. The weather alternated between rain and sunshine. 
   时而下雨,时而放晴。

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