大礼堂上方28000平方英尺的绿色屋顶种植着景天属植物——一种抗旱植物。
The 28, 000-square-foot green roof over the auditorium is planted with sedum, a drought-resistant plant.
景天，蝎子草：任一种景天属植物，有厚而多肉的叶子。
Any of numerous plants of the genus Sedum, having thick, fleshy leaves.
景天属植物是仅需少量水分，并经常被用在绿色屋顶上的植物。
Sedums are plants that need little water and often are used on green roofs.
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