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high-grade

adjective

🔊/ˌhaɪ ˈɡreɪd/

🔊/ˌhaɪ ˈɡreɪd/

[usually before noun]

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of very good quality优质的；高级的
- high-grade petrol优质汽油
Oxford Collocations Dictionary
High-grade is used with these nouns:
ore
See full entry