n.[C]

1. （沙漠中的）綠洲
2. 【喻】（困境中的）令人寬慰的事物或處所
   The town was an oasis of prosperity in a desert of poverty.

   該鎮是貧窮荒漠中的一塊繁榮的"綠洲"。

n.

1. a fertile spot in a desert where the water table rises to ground level.
2. an area or period of calm in the midst of a difficult or hectic place or situation.