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(惡劣環境中的)宜人之地,樂土;(不愉快情形下的)開心之時,樂事
You can refer to a pleasant place or situation as an oasis when it is surrounded by unpleasant ones.
例句
The immaculately tended gardens are an oasis in the midst of Cairo's urban sprawl.
在開羅不斷擴張的都市版圖內,這些被悉心照料的花園成了一片世外桃源。