I just want an even chance to get my money back.

我只是想要一个平等的机会来拿回我的钱。

“It won't work, ” the clerk said. “You can't get a even chance with a coin.”

“这不好。”那个职员说，“抛硬币不是一个公平、合理的办法。”

Researchers concluded that on average, environmental and genetic factors have an even chance of influencing a person's traits and the diseases they might suffer from.

研究人员得出结论：在平均水平上，环境和遗传因素对一个人的特征和患病可能性有相等的影响机会。

And even if it was and the body was found, there was rather better than an even chance that the body would not be correctly identified.

即使找到了并且找到了尸体， 也有可能无法正确识别尸体。