名词
中文翻译：定期维护
同义词：
['Regular upkeep', 'Regular servicing', 'Regular repair']
例句：
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1. The bridge and tunnel need regular maintenance to ensure their safety and longevity.
桥梁和隧道需要定期维护以确保其安全和持久。
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2.The maintenance crew is responsible for the regular inspection of the bridge and tunnel.
维修队负责定期检查桥梁和隧道。
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3. The regular maintenance of the bridge and tunnel helps prevent accidents and ensures smooth traffic flow.
桥梁和隧道的定期维护有助于预防事故并确保交通流畅。