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premium grade
econ. 优级
interntl.trade. 珍贵优质的商品
space 优等品
tech. 高级; 优等; 一级
premium-grade
gen. 高级的
plast. 优质的
premium grades
plast. 优等品
premium grade: 6 phrases in 3 subjects
Automobiles4
Metallurgy1
Oil / petroleum1