There was an unspoken assumption among many of Fox's friends that these were special circumstances.福克斯的许多朋友心照不宣地假设，这些都是特殊情况。Prisoners are only allowed to visit their families in special circumstances.犯人只有在特殊情况下才可探视家人。Only under special circumstances will you be allowed to retake the test.只有在特殊情况下才能允许你重新考试。