The billing policies are not part of the service; they constitute an external element that the billing service makes use of.
账单策略并不是账单服务的组成部分；它们是账单服务使用的外部元素。
The 'room in room system' creates views through all the rooms of the living and office areas and out onto the central external element, the garden atrium.
“房中房”的格局让视线可以毫无障碍地穿过生活区域和办公区域，到达中心的外部空间—花园。
The 'room in room system' creates views through all the rooms of the living and office areas and out onto the central external element, the garden atrium.
“房中房”的格局让视线可以毫无障碍地穿过生活区域和办公区域，到达中心的外部空间—花园。
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