库伦一家每隔两个月都要外出度假一次。
雅马哈负责钢琴的维护事宜，每隔一两个月会调一次音。
F. division that manages its stations, rents the instruments from the manufacturer, Yamaha, which maintains them and tunes them every month or two.
雅马哈负责钢琴的维护事宜，每隔一两个月会调一次音。
F. division that manages its stations, rents the instruments from the manufacturer, Yamaha, which maintains them and tunes them every month or two.
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