名词
中文翻译：优质等级
同义词：
['high grade', 'top grade', 'top quality']
例句：
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1.The company's premium grade product is highly sought after by customers.
该公司的优质产品受到客户的极大追捧。
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2. The premium grade wine is priced significantly higher than the standard version.
这款优质酒的价格远高于普通版本。
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3.The premium grade diamonds are rare and expensive.
这些优质钻石稀有且价格昂贵。