在沙漠中找到一片绿洲的概率几乎是百万分之一。

The chance of finding an oasis in the desert is ___million-to-one.

在这种百万分之一的几率下，她竟然找到了那颗失踪已久的钻石。

Against all odds, she found that long-lost diamond in a ___million-to-one chance.