然后，重点讨论了空间圆和当地水平面投影圆两种绕飞轨道。

Then, emphasis is placed on circular and projected circular flying-around orbits.

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第一部分和道路处在同一个水平面上，包括主客厅，休息厅，游戏室，车库，地下室和当地地热系统。

The first part is on the same level as the road and includes the main hall, the laundry, the play-room, the garage, the cellar and the geothermal energy local.

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