在天坛处处可见中国古人对天的敬重。黄穹宇顶部的蓝色琉璃瓦象征至高无上的青天。圜丘坛以九和九的倍数铺设。代表天无限大。Chinese show their ____ in Tiāntán. The blue-glazed tiles of the imperial vault of heaven represent heaven. The circular mound altar is surrounded by a ring of nine plates, which are also surrounded by multiples of nine plates. It ____ the supremacy of heaven.