绿洲, 避风港
a pleasant or peaceful area or period in the midst of a difficult, troubled, or hectic place or situation
示例:
• Her garden was an oasis of calm in the busy city. 她的花园是繁忙城市中的一片宁静绿洲。 • The library was an oasis for students seeking quiet study time. 图书馆是学生们寻求安静学习时间的绿洲。