For example, a machine tool is sold to someone in exchange for money or a mechanic offers a service by repairing a machine tool for money, which we call sales.
例如，将一台机床卖给某人成交得钱，或者一个机修工提供修理机床的服务而得钱，我们都称之为销售。
Therefore, Numeric control machine tool that is key set becomes the key matter in the process of manufacturing and using. Given that, maintenance is on long term basis while repairing work is not.
因之，作为关键设备的数控机床就成日常操作和使用中的核心问题，而就此而言，维护是长期的，维修和排故是偶然的和不确定的。
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