an area in the desert where there is water and where plants grow （沙漠中的）绿洲 a pleasant place or period of time in the middle of something unpleasant or difficult （困苦中）令人快慰的地方（或时刻）；乐土；乐事 an oasis of calm 宁静的一刻 a green oasis in the heart of the city 都市中心的绿茵
Word Originearly 17th cent.: via late Latin from Greek, apparently of Egyptian origin.