1
be a-one
The service at that restaurant is a-one.
那家餐厅的服务是一流的。
第一等的；第一流的
先理解核心含义，再看它在真实句子里的用法。
第一等的；第一流的
of the highest quality
The service at that restaurant is a-one.
那家餐厅的服务是一流的。
第一等的；第一流的
s of the highest quality
The service at that hotel was a-one.
那家酒店的服务是一流的。
She always does an a-one job on her projects.
她总是把项目做得尽善尽美。
This restaurant serves a-one cuisine.
这家餐厅提供一流的菜肴。
The service at that restaurant is a-one.
那家餐厅的服务是一流的。
They provide a-one customer support.
他们提供一流的客户支持。
Not this
He is a a-one.
Use this
He is a-one.
“a-one”是形容词，作表语时前面不能加冠词。
Not this
He is a a-one student.
Use this
He is an a-one student.
“a-one”以元音音素/eɪ/开头，其前的不定冠词应为“an”，而非“a”。
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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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Dictionary facts from ECDICT, WORDNET.