Ball clay in Jilin province is one of the earliest recognized and discovered Neogene Period ball clay in China.
吉林球黏土是我国最早甄别和发现的第三纪球黏土。
S. A. Resarches in recent years reveal that a lot of ball clay mineral resources occur in China and ball clay is exported from China.
近年来经过我们专题研究，甄别和发现了大量的球黏土矿区还有深加工产品，改进口为出口。
S. A. Resarches in recent years reveal that a lot of ball clay mineral resources occur in China and ball clay is exported from China.
近年来经过我们专题研究，甄别和发现了大量的球黏土矿区还有深加工产品，改进口为出口。
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