... low grade material 低级别材料 premium-grade material 高级材料 weapons-grade material 武器级别材料 ...
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The compound tussah silk is a premium grade material that has the high performance of the natural protein fiber and other fiber.
柞蚕复合丝是集天然蛋白纤维及其他纤维的优良性于一身的高级材料。
Types ASPA-1 and ASPA-2 alumina-silica fiber paper are premium grade lightweight refractory material made from high-purity alumina-silica fibers formed into highly flexible sheets.
ASPA - 1型和aspa - 2型的氧化铝—氧化硅纤维纸是优质的轻质耐火材料，它们由高纯度的氧化铝—氧化硅纤维制造成高弹性的薄片状的。
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