It is called Tiehpan, which means "iron plate," because of a slab of sedimentary rock on the ocean floor. At low tide, the sun's reflection makes it look like a large sheet of iron.
之所以名為鐵板，是因為海底的一塊沉積岩板在大退潮時會露出水面，在陽光照射下閃閃發光，像塊大鐵板。