“even money”别理解成“相等的钱”，其正确的含义是（成功或失败的）均等机会；有均等机会的人（或事）。

【例句】
I've been training all year, but my opponent is exceptionally tough, so I'd say it's even money as to who will win.
我训练了一整年，但是我的对手是极其的强，所以我觉得我们有均等的机会赢得比赛。

He has an even money chance of winning the race.
他有同等机会赢得这场比赛。