Normal alternation of body temperature 体温的正常变动
normal alternation
正常的交替
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Before alternation, failures often occurred in the hoist control system of tail water gate in Ankang Hydropower Station, which had impact the normal electricity generation.
安康电站尾水门机电气控制系统在改造前故障时有发生，严重影响电站正常生产，甚至威胁到电站防汛工作的开展。
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