Marathons are the real McCoy these little jogs are no challenge at all.

马拉松赛跑才是真玩意儿——这些慢跑根本不算回事。

youdao

It's an American flying jacket, the real McCoy.

这是件真正的美国飞行员夹克。

《牛津词典》

The duck liver pate was the real McCoy. It tasted so much better than the stuff in tins they call duck liver pate back home.

那个用鸭肝做的头吃起来真正点。它吃起来比用罐子装的那些鸭肝头好起多了。

youdao

Mr. Jerome contends that only he knows the tell-tale sign distinguishing the real McCoy from the impostors who occasionally turn up.

WSJ: A Midnight Dreary for Those Who Seek Tell-Tale Signs of Poe's Elusive 'Toaster'

Dr Venter's was the real McCoy: when he put the viral DNA into host cells they started to spit out new viruses just as self-destructively as cells infected with the natural Phi-X174.

ECONOMIST: Artificial lifeforms

Second Avenue Kosher Deli -- The real McCoy: plentiful portions.

FORBES: Fact and Comment