greenalite

用法例句

Because of red soil process strongly, earthy manganese-iron deposits widely distribute, resources are huge, ores are easily exploited and difficultly beneficiated, regarded as black soil long term.

湘南地区红土化作用强烈,土状锰铁矿分布广,蕴藏量巨大,矿石易采难选,长期被当作地下“黑土”。