名词
中文翻译：正常运营期
同义词：
['average operating period', 'average life cycle']
例句：
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1.The normal operating period for this machine is six months.
这台机器的正常运营期是六个月。
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2. During the normal operating period, we should ensure that all systems are functioning properly.
在正常运营期，我们应确保所有系统都正常运行。
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3.The company's normal operating period is typically three years.
公司的正常运营期通常是三年。