石珊瑚

例句：

1. 1. The coral reef is a natural wonder that attracts tourists from all over the world.
   珊瑚礁是一个自然奇观，吸引了来自世界各地的游客。
2. 2. The coral reef is an important habitat for many marine species.
   珊瑚礁是许多海洋物种的重要栖息地。
3. 3. The coral reef is threatened by pollution and climate change.
   珊瑚礁因污染和气候变化而受到威胁。