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词汇 维修保养
例句 I have a service agreement for my gas boiler.我的煤气锅炉有维修保养协议。The upkeep of a yacht is very expensive.游艇的维修保养费是很昂贵的。In the future the machines will need spare parts and maintenance.这些机器将来会需要备件和维修保养
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