1
first-class + noun
用作定语，修饰名词，表示品质最高。
They offer first-class service.
他们提供一流的服务。
一流的；最好的；顶级的
先理解核心含义，再看它在真实句子里的用法。
一流的；最好的；顶级的
very good; of the highest quality
They offer first-class service.
他们提供一流的服务。
非常好；最高质量的
very good;of the highest quality
The hotel offered first-class service during our entire stay.
这家酒店在我们整个住宿期间提供了一流的服务。
AI contextual example
The quality of the handmade table is first-class.
这张手工桌子的质量是一流的。
AI contextual example
She prepared a first-class meal for her guests using fresh ingredients.
她用新鲜食材为客人准备了一顿一流的饭菜。
AI contextual example
a first-class mind
一流的头脑。
WordNet
用作定语，修饰名词，表示品质最高。
They offer first-class service.
他们提供一流的服务。
用作表语，位于系动词后，描述主语品质。
This hotel is first-class.
这家酒店是一流的。
Not this
This is a first class seat.
Use this
This is a first-class seat.
当‘first-class’用作形容词时，必须保留连字符，否则会变成名词短语‘first class’（头等舱），导致语法混淆。
Not this
I bought a first-class for the trip.
Use this
I bought a first-class ticket for the trip.
‘first-class’是形容词，不能单独作名词；后面需要接被修饰的名词（如ticket, seat等）。
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Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
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Collins 词频等级为 2，建议结合例句记忆，而不是只背中文释义。
Dictionary facts from DICTIONARY_API_DEV, ECDICT.