除此之外，其他更常见的楼宇，如公寓、医院和学校的屋顶上也可以开展相关研究。
More modest, rooftop operations on apartment complexes, hospitals and schools could be test beds, too.
在今年的3月13日，一只仙鹤着陆在了学校建筑物的屋顶上。
This year at 13rd March a male stork landed on the roof of the school building in Brodska Varos.
学校的屋顶上，鸽子低声地咕咕地叫着，我一边听，一边寻思：“他们该不会强迫这些鸽子用德语唱歌吧？”
On the roof of the schoolhouse, pigeons cooed in low tones, and I said to myself as I listened to them.
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