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。
The management categories of CNPC's supplies include primary material suppliers and secondary material suppliers.
中国石油物资供应商的管理类别包括一级采购物资供应商和二级采购物资供应商。
Do you find most of your reading material from other blogs or from primary sources?
你是从别人的博客中还是从主流来源找到大多数阅读材料的？
Pine is the primary building material of the museum.
松木是构建博物馆的主要建筑材料。
Contact material and plating are the primary factors that determine this specification.
触点材料和镀层是决定该指标的主要因素。
Ironstone is primary original material of metallurgy enterprise.
铁矿石是冶金企业生产的主要原材料。
Primary teeth; Root canal therapy; Root canal filling material.
乳牙；根管治疗；根管充填材料。
Ceramsite is a new primary and potential structural material.
陶粒是一种新型的、有发展潜力的建筑材料。
The coal is primary energy and essential industry raw material of our country.
煤炭是我国的主要能源和重要工业原料。
The coal is primary energy and essential industry raw material of our country.
煤炭是我国的主要能源和重要工业原料。
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