Many children never finish grade school.
很多孩子读不完高中。
A rolled, rigidized surface finish and high MOR give a tough, economic refractory grade product.
通过滚压刚化表面涂饰和高mor，得到的坚固、经济的耐火级产品。
A rolled, rigidized surface finish and high MOR give a tough, economic refractory grade product.
通过滚压刚化表面涂饰和高mor，得到的坚固、经济的耐火级产品。
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