在炎热的沙漠中，远处出现的海市蜃楼让他们误以为找到了水源。

The ___mirage in the hot desert tricked them into thinking they found water.

沙漠中的绿洲只是一个海市蜃楼，走近就消失了。

The oasis in the desert was just a ___mirage, disappearing as we got closer.