Reserves of coal, coal bed methane gas, bauxite, refractory clay, potassic rock and so on rank first in China.是什么意思_Reserves of coal, coal bed methane gas, bauxite, refractory clay, potassic rock and so on rank first in China.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句