With the global economic recovery, bulk raw material prices continued to rise.
随着全球经济复苏，大宗原材料商品价格持续走高。
A bulk layer includes the primary material and is free of the secondary material.
一主体层包含该主要材料而不含该次要材料。
A bulk layer includes the primary material and is free of the secondary material.
一主体层包含该主要材料而不含该次要材料。
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