China clay: The deposits of china clay in Cornwall are of great economic value.
China clay: The deposits of china clay in Cornwall are of great economic value.
瓷土：康沃尔的瓷土沉淀带来了巨大的经济价值。
China clay: The deposits of china clay in Cornwall are of great economic value.
瓷土：康沃尔的瓷土沉淀带来了巨大的经济价值。