是第一流的;是最好的
to be the best at a particular activity
As a long-distance runner, she's in a class of her own. 作为一名长跑选手，她是一流的。
Morris is in a class of his own amongst manufacturing executives.
When it comes to gratuitous insults, this city's taxi drivers are in a class of their own.
They soon discovered that their new fundraising officer was in a class of her own.
He's a bit lazy, but judged on ability, he's in a class of his own.
See also: class noun (RANK)