Careful how you handle that gun. It's the real McCoy.

你摆弄那支枪可要当心. 那是真枪啊.

《现代英汉综合大词典》

Yes , it is the real McCoy!

是真的, 货真价实!

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This silver dollar is the real McCoy.

这枚银币是纯银的.

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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.

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