名词
中文翻译：维护成本同义词
同义词：
['operating cost', 'repair cost', 'maintenance expense']
例句：
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1. The company's annual maintenance cost is $500,000.
公司的年度维护成本为50万美元。
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2. To keep the equipment in good condition, we need to maintain a certain level of maintenance cost.
为了保持设备良好状态，我们需要保持一定的维护成本水平。
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3. The cost of maintaining the infrastructure is a significant factor in the budget.
基础设施维护的成本是预算中的一个重要因素。